<?php

/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.8.0, 2014-03-02
 */

// Original file header of PEAR::Spreadsheet_Excel_Writer_Worksheet (used as the base for this class):
// -----------------------------------------------------------------------------------------
// /*
// * Module written/ported by Xavier Noguer <xnoguer@rezebra.com>
// *
// * The majority of this is _NOT_ my code. I simply ported it from the
// * PERL Spreadsheet::WriteExcel module.
// *
// * The author of the Spreadsheet::WriteExcel module is John McNamara
// * <jmcnamara@cpan.org>
// *
// * I _DO_ maintain this code, and John McNamara has nothing to do with the
// * porting of this code to PHP. Any questions directly related to this
// * class library should be directed to me.
// *
// * License Information:
// *
// * Spreadsheet_Excel_Writer: A library for generating Excel Spreadsheets
// * Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com
// *
// * This library is free software; you can redistribute it and/or
// * modify it under the terms of the GNU Lesser General Public
// * License as published by the Free Software Foundation; either
// * version 2.1 of the License, or (at your option) any later version.
// *
// * This library is distributed in the hope that it will be useful,
// * but WITHOUT ANY WARRANTY; without even the implied warranty of
// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// * Lesser General Public License for more details.
// *
// * You should have received a copy of the GNU Lesser General Public
// * License along with this library; if not, write to the Free Software
// * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// */

/**
 * PHPExcel_Writer_Excel5_Worksheet
 *
 * @category PHPExcel
 * @package PHPExcel_Writer_Excel5
 * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
{

    /**
     * Formula parser
     *
     * @var PHPExcel_Writer_Excel5_Parser
     */
    private $_parser;

    /**
     * Maximum number of characters for a string (LABEL record in BIFF5)
     * 
     * @var integer
     */
    public $_xls_strmax;

    /**
     * Array containing format information for columns
     * 
     * @var array
     */
    public $_colinfo;

    /**
     * Array containing the selected area for the worksheet
     * 
     * @var array
     */
    public $_selection;

    /**
     * The active pane for the worksheet
     * 
     * @var integer
     */
    public $_active_pane;

    /**
     * Whether to use outline.
     * 
     * @var integer
     */
    public $_outline_on;

    /**
     * Auto outline styles.
     * 
     * @var bool
     */
    public $_outline_style;

    /**
     * Whether to have outline summary below.
     * 
     * @var bool
     */
    public $_outline_below;

    /**
     * Whether to have outline summary at the right.
     * 
     * @var bool
     */
    public $_outline_right;

    /**
     * Reference to the total number of strings in the workbook
     * 
     * @var integer
     */
    public $_str_total;

    /**
     * Reference to the number of unique strings in the workbook
     * 
     * @var integer
     */
    public $_str_unique;

    /**
     * Reference to the array containing all the unique strings in the workbook
     * 
     * @var array
     */
    public $_str_table;

    /**
     * Color cache
     */
    private $_colors;

    /**
     * Index of first used row (at least 0)
     * 
     * @var int
     */
    private $_firstRowIndex;

    /**
     * Index of last used row.
     * (no used rows means -1)
     * 
     * @var int
     */
    private $_lastRowIndex;

    /**
     * Index of first used column (at least 0)
     * 
     * @var int
     */
    private $_firstColumnIndex;

    /**
     * Index of last used column (no used columns means -1)
     * 
     * @var int
     */
    private $_lastColumnIndex;

    /**
     * Sheet object
     * 
     * @var PHPExcel_Worksheet
     */
    public $_phpSheet;

    /**
     * Count cell style Xfs
     *
     * @var int
     */
    private $_countCellStyleXfs;

    /**
     * Escher object corresponding to MSODRAWING
     *
     * @var PHPExcel_Shared_Escher
     */
    private $_escher;

    /**
     * Array of font hashes associated to FONT records index
     *
     * @var array
     */
    public $_fntHashIndex;

    /**
     * Constructor
     *
     * @param
     *            int &$str_total Total number of strings
     * @param
     *            int &$str_unique Total number of unique strings
     * @param
     *            array &$str_table String Table
     * @param
     *            array &$colors Colour Table
     * @param mixed $parser
     *            The formula parser created for the Workbook
     * @param boolean $preCalculateFormulas
     *            Flag indicating whether formulas should be calculated or just written
     * @param string $phpSheet
     *            The worksheet to write
     * @param PHPExcel_Worksheet $phpSheet            
     */
    public function __construct(&$str_total, &$str_unique, &$str_table, &$colors, $parser, $preCalculateFormulas, $phpSheet)
    {
        // It needs to call its parent's constructor explicitly
        parent::__construct();
        
        // change BIFFwriter limit for CONTINUE records
        // $this->_limit = 8224;
        
        $this->_preCalculateFormulas = $preCalculateFormulas;
        $this->_str_total = &$str_total;
        $this->_str_unique = &$str_unique;
        $this->_str_table = &$str_table;
        $this->_colors = &$colors;
        $this->_parser = $parser;
        
        $this->_phpSheet = $phpSheet;
        
        // $this->ext_sheets = array();
        // $this->offset = 0;
        $this->_xls_strmax = 255;
        $this->_colinfo = array();
        $this->_selection = array(
            0,
            0,
            0,
            0
        );
        $this->_active_pane = 3;
        
        $this->_print_headers = 0;
        
        $this->_outline_style = 0;
        $this->_outline_below = 1;
        $this->_outline_right = 1;
        $this->_outline_on = 1;
        
        $this->_fntHashIndex = array();
        
        // calculate values for DIMENSIONS record
        $minR = 1;
        $minC = 'A';
        
        $maxR = $this->_phpSheet->getHighestRow();
        $maxC = $this->_phpSheet->getHighestColumn();
        
        // Determine lowest and highest column and row
        // $this->_firstRowIndex = ($minR > 65535) ? 65535 : $minR;
        $this->_lastRowIndex = ($maxR > 65535) ? 65535 : $maxR;
        
        $this->_firstColumnIndex = PHPExcel_Cell::columnIndexFromString($minC);
        $this->_lastColumnIndex = PHPExcel_Cell::columnIndexFromString($maxC);
        
        // if ($this->_firstColumnIndex > 255) $this->_firstColumnIndex = 255;
        if ($this->_lastColumnIndex > 255)
            $this->_lastColumnIndex = 255;
        
        $this->_countCellStyleXfs = count($phpSheet->getParent()->getCellStyleXfCollection());
    }

    /**
     * Add data to the beginning of the workbook (note the reverse order)
     * and to the end of the workbook.
     *
     * @access public
     * @see PHPExcel_Writer_Excel5_Workbook::storeWorkbook()
     */
    function close()
    {
        $_phpSheet = $this->_phpSheet;
        
        $num_sheets = $_phpSheet->getParent()->getSheetCount();
        
        // Write BOF record
        $this->_storeBof(0x0010);
        
        // Write PRINTHEADERS
        $this->_writePrintHeaders();
        
        // Write PRINTGRIDLINES
        $this->_writePrintGridlines();
        
        // Write GRIDSET
        $this->_writeGridset();
        
        // Calculate column widths
        $_phpSheet->calculateColumnWidths();
        
        // Column dimensions
        if (($defaultWidth = $_phpSheet->getDefaultColumnDimension()->getWidth()) < 0) {
            $defaultWidth = PHPExcel_Shared_Font::getDefaultColumnWidthByFont($_phpSheet->getParent()
                ->getDefaultStyle()
                ->getFont());
        }
        
        $columnDimensions = $_phpSheet->getColumnDimensions();
        $maxCol = $this->_lastColumnIndex - 1;
        for ($i = 0; $i <= $maxCol; ++ $i) {
            $hidden = 0;
            $level = 0;
            $xfIndex = 15; // there are 15 cell style Xfs
            
            $width = $defaultWidth;
            
            $columnLetter = PHPExcel_Cell::stringFromColumnIndex($i);
            if (isset($columnDimensions[$columnLetter])) {
                $columnDimension = $columnDimensions[$columnLetter];
                if ($columnDimension->getWidth() >= 0) {
                    $width = $columnDimension->getWidth();
                }
                $hidden = $columnDimension->getVisible() ? 0 : 1;
                $level = $columnDimension->getOutlineLevel();
                $xfIndex = $columnDimension->getXfIndex() + 15; // there are 15 cell style Xfs
            }
            
            // Components of _colinfo:
            // $firstcol first column on the range
            // $lastcol last column on the range
            // $width width to set
            // $xfIndex The optional cell style Xf index to apply to the columns
            // $hidden The optional hidden atribute
            // $level The optional outline level
            $this->_colinfo[] = array(
                $i,
                $i,
                $width,
                $xfIndex,
                $hidden,
                $level
            );
        }
        
        // Write GUTS
        $this->_writeGuts();
        
        // Write DEFAULTROWHEIGHT
        $this->_writeDefaultRowHeight();
        
        // Write WSBOOL
        $this->_writeWsbool();
        
        // Write horizontal and vertical page breaks
        $this->_writeBreaks();
        
        // Write page header
        $this->_writeHeader();
        
        // Write page footer
        $this->_writeFooter();
        
        // Write page horizontal centering
        $this->_writeHcenter();
        
        // Write page vertical centering
        $this->_writeVcenter();
        
        // Write left margin
        $this->_writeMarginLeft();
        
        // Write right margin
        $this->_writeMarginRight();
        
        // Write top margin
        $this->_writeMarginTop();
        
        // Write bottom margin
        $this->_writeMarginBottom();
        
        // Write page setup
        $this->_writeSetup();
        
        // Write sheet protection
        $this->_writeProtect();
        
        // Write SCENPROTECT
        $this->_writeScenProtect();
        
        // Write OBJECTPROTECT
        $this->_writeObjectProtect();
        
        // Write sheet password
        $this->_writePassword();
        
        // Write DEFCOLWIDTH record
        $this->_writeDefcol();
        
        // Write the COLINFO records if they exist
        if (! empty($this->_colinfo)) {
            $colcount = count($this->_colinfo);
            for ($i = 0; $i < $colcount; ++ $i) {
                $this->_writeColinfo($this->_colinfo[$i]);
            }
        }
        $autoFilterRange = $_phpSheet->getAutoFilter()->getRange();
        if (! empty($autoFilterRange)) {
            // Write AUTOFILTERINFO
            $this->_writeAutoFilterInfo();
        }
        
        // Write sheet dimensions
        $this->_writeDimensions();
        
        // Row dimensions
        foreach ($_phpSheet->getRowDimensions() as $rowDimension) {
            $xfIndex = $rowDimension->getXfIndex() + 15; // there are 15 cellXfs
            $this->_writeRow($rowDimension->getRowIndex() - 1, $rowDimension->getRowHeight(), $xfIndex, ($rowDimension->getVisible() ? '0' : '1'), $rowDimension->getOutlineLevel());
        }
        
        // Write Cells
        foreach ($_phpSheet->getCellCollection() as $cellID) {
            $cell = $_phpSheet->getCell($cellID);
            $row = $cell->getRow() - 1;
            $column = PHPExcel_Cell::columnIndexFromString($cell->getColumn()) - 1;
            
            // Don't break Excel!
            // if ($row + 1 > 65536 or $column + 1 > 256) {
            if ($row > 65535 || $column > 255) {
                break;
            }
            
            // Write cell value
            $xfIndex = $cell->getXfIndex() + 15; // there are 15 cell style Xfs
            
            $cVal = $cell->getValue();
            if ($cVal instanceof PHPExcel_RichText) {
                // $this->_writeString($row, $column, $cVal->getPlainText(), $xfIndex);
                $arrcRun = array();
                $str_len = PHPExcel_Shared_String::CountCharacters($cVal->getPlainText(), 'UTF-8');
                $str_pos = 0;
                $elements = $cVal->getRichTextElements();
                foreach ($elements as $element) {
                    // FONT Index
                    if ($element instanceof PHPExcel_RichText_Run) {
                        $str_fontidx = $this->_fntHashIndex[$element->getFont()->getHashCode()];
                    } else {
                        $str_fontidx = 0;
                    }
                    $arrcRun[] = array(
                        'strlen' => $str_pos,
                        'fontidx' => $str_fontidx
                    );
                    // Position FROM
                    $str_pos += PHPExcel_Shared_String::CountCharacters($element->getText(), 'UTF-8');
                }
                $this->_writeRichTextString($row, $column, $cVal->getPlainText(), $xfIndex, $arrcRun);
            } else {
                switch ($cell->getDatatype()) {
                    case PHPExcel_Cell_DataType::TYPE_STRING:
                    case PHPExcel_Cell_DataType::TYPE_NULL:
                        if ($cVal === '' || $cVal === null) {
                            $this->_writeBlank($row, $column, $xfIndex);
                        } else {
                            $this->_writeString($row, $column, $cVal, $xfIndex);
                        }
                        break;
                    
                    case PHPExcel_Cell_DataType::TYPE_NUMERIC:
                        $this->_writeNumber($row, $column, $cVal, $xfIndex);
                        break;
                    
                    case PHPExcel_Cell_DataType::TYPE_FORMULA:
                        $calculatedValue = $this->_preCalculateFormulas ? $cell->getCalculatedValue() : null;
                        $this->_writeFormula($row, $column, $cVal, $xfIndex, $calculatedValue);
                        break;
                    
                    case PHPExcel_Cell_DataType::TYPE_BOOL:
                        $this->_writeBoolErr($row, $column, $cVal, 0, $xfIndex);
                        break;
                    
                    case PHPExcel_Cell_DataType::TYPE_ERROR:
                        $this->_writeBoolErr($row, $column, self::_mapErrorCode($cVal), 1, $xfIndex);
                        break;
                }
            }
        }
        
        // Append
        $this->_writeMsoDrawing();
        
        // Write WINDOW2 record
        $this->_writeWindow2();
        
        // Write PLV record
        $this->_writePageLayoutView();
        
        // Write ZOOM record
        $this->_writeZoom();
        if ($_phpSheet->getFreezePane()) {
            $this->_writePanes();
        }
        
        // Write SELECTION record
        $this->_writeSelection();
        
        // Write MergedCellsTable Record
        $this->_writeMergedCells();
        
        // Hyperlinks
        foreach ($_phpSheet->getHyperLinkCollection() as $coordinate => $hyperlink) {
            list ($column, $row) = PHPExcel_Cell::coordinateFromString($coordinate);
            
            $url = $hyperlink->getUrl();
            
            if (strpos($url, 'sheet://') !== false) {
                // internal to current workbook
                $url = str_replace('sheet://', 'internal:', $url);
            } else 
                if (preg_match('/^(http:|https:|ftp:|mailto:)/', $url)) {
                    // URL
                    // $url = $url;
                } else {
                    // external (local file)
                    $url = 'external:' . $url;
                }
            
            $this->_writeUrl($row - 1, PHPExcel_Cell::columnIndexFromString($column) - 1, $url);
        }
        
        $this->_writeDataValidity();
        $this->_writeSheetLayout();
        
        // Write SHEETPROTECTION record
        $this->_writeSheetProtection();
        $this->_writeRangeProtection();
        
        $arrConditionalStyles = $_phpSheet->getConditionalStylesCollection();
        if (! empty($arrConditionalStyles)) {
            $arrConditional = array();
            // @todo CFRule & CFHeader
            // Write CFHEADER record
            $this->_writeCFHeader();
            // Write ConditionalFormattingTable records
            foreach ($arrConditionalStyles as $cellCoordinate => $conditionalStyles) {
                foreach ($conditionalStyles as $conditional) {
                    if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_EXPRESSION || $conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CELLIS) {
                        if (! in_array($conditional->getHashCode(), $arrConditional)) {
                            $arrConditional[] = $conditional->getHashCode();
                            // Write CFRULE record
                            $this->_writeCFRule($conditional);
                        }
                    }
                }
            }
        }
        
        $this->_storeEof();
    }

    /**
     * Write a cell range address in BIFF8
     * always fixed range
     * See section 2.5.14 in OpenOffice.org's Documentation of the Microsoft Excel File Format
     *
     * @param string $range
     *            E.g. 'A1' or 'A1:B6'
     * @return string Binary data
     */
    private function _writeBIFF8CellRangeAddressFixed($range = 'A1')
    {
        $explodes = explode(':', $range);
        
        // extract first cell, e.g. 'A1'
        $firstCell = $explodes[0];
        
        // extract last cell, e.g. 'B6'
        if (count($explodes) == 1) {
            $lastCell = $firstCell;
        } else {
            $lastCell = $explodes[1];
        }
        
        $firstCellCoordinates = PHPExcel_Cell::coordinateFromString($firstCell); // e.g. array(0, 1)
        $lastCellCoordinates = PHPExcel_Cell::coordinateFromString($lastCell); // e.g. array(1, 6)
        
        return (pack('vvvv', $firstCellCoordinates[1] - 1, $lastCellCoordinates[1] - 1, PHPExcel_Cell::columnIndexFromString($firstCellCoordinates[0]) - 1, PHPExcel_Cell::columnIndexFromString($lastCellCoordinates[0]) - 1));
    }

    /**
     * Retrieves data from memory in one chunk, or from disk in $buffer
     * sized chunks.
     *
     * @return string The data
     */
    function getData()
    {
        $buffer = 4096;
        
        // Return data stored in memory
        if (isset($this->_data)) {
            $tmp = $this->_data;
            unset($this->_data);
            return $tmp;
        }
        // No data to return
        return false;
    }

    /**
     * Set the option to print the row and column headers on the printed page.
     *
     * @access public
     * @param integer $print
     *            Whether to print the headers or not. Defaults to 1 (print).
     */
    function printRowColHeaders($print = 1)
    {
        $this->_print_headers = $print;
    }

    /**
     * This method sets the properties for outlining and grouping.
     * The defaults
     * correspond to Excel's defaults.
     *
     * @param bool $visible            
     * @param bool $symbols_below            
     * @param bool $symbols_right            
     * @param bool $auto_style            
     */
    function setOutline($visible = true, $symbols_below = true, $symbols_right = true, $auto_style = false)
    {
        $this->_outline_on = $visible;
        $this->_outline_below = $symbols_below;
        $this->_outline_right = $symbols_right;
        $this->_outline_style = $auto_style;
        
        // Ensure this is a boolean vale for Window2
        if ($this->_outline_on) {
            $this->_outline_on = 1;
        }
    }

    /**
     * Write a double to the specified row and column (zero indexed).
     * An integer can be written as a double. Excel will display an
     * integer. $format is optional.
     *
     * Returns 0 : normal termination
     * -2 : row or column out of range
     *
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param float $num
     *            The number to write
     * @param mixed $xfIndex
     *            The optional XF format
     * @return integer
     */
    private function _writeNumber($row, $col, $num, $xfIndex)
    {
        $record = 0x0203; // Record identifier
        $length = 0x000E; // Number of bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("vvv", $row, $col, $xfIndex);
        $xl_double = pack("d", $num);
        if (self::getByteOrder()) { // if it's Big Endian
            $xl_double = strrev($xl_double);
        }
        
        $this->_append($header . $data . $xl_double);
        return (0);
    }

    /**
     * Write a LABELSST record or a LABEL record.
     * Which one depends on BIFF version
     *
     * @param int $row
     *            Row index (0-based)
     * @param int $col
     *            Column index (0-based)
     * @param string $str
     *            The string
     * @param int $xfIndex
     *            Index to XF record
     */
    private function _writeString($row, $col, $str, $xfIndex)
    {
        $this->_writeLabelSst($row, $col, $str, $xfIndex);
    }

    /**
     * Write a LABELSST record or a LABEL record.
     * Which one depends on BIFF version
     * It differs from _writeString by the writing of rich text strings.
     * 
     * @param int $row
     *            Row index (0-based)
     * @param int $col
     *            Column index (0-based)
     * @param string $str
     *            The string
     * @param mixed $xfIndex
     *            The XF format index for the cell
     * @param array $arrcRun
     *            Index to Font record and characters beginning
     */
    private function _writeRichTextString($row, $col, $str, $xfIndex, $arrcRun)
    {
        $record = 0x00FD; // Record identifier
        $length = 0x000A; // Bytes to follow
        $str = PHPExcel_Shared_String::UTF8toBIFF8UnicodeShort($str, $arrcRun);
        
        /* check if string is already present */
        if (! isset($this->_str_table[$str])) {
            $this->_str_table[$str] = $this->_str_unique ++;
        }
        $this->_str_total ++;
        
        $header = pack('vv', $record, $length);
        $data = pack('vvvV', $row, $col, $xfIndex, $this->_str_table[$str]);
        $this->_append($header . $data);
    }

    /**
     * Write a string to the specified row and column (zero indexed).
     * NOTE: there is an Excel 5 defined limit of 255 characters.
     * $format is optional.
     * Returns 0 : normal termination
     * -2 : row or column out of range
     * -3 : long string truncated to 255 chars
     *
     * @access public
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param string $str
     *            The string to write
     * @param mixed $xfIndex
     *            The XF format index for the cell
     * @return integer
     */
    private function _writeLabel($row, $col, $str, $xfIndex)
    {
        $strlen = strlen($str);
        $record = 0x0204; // Record identifier
        $length = 0x0008 + $strlen; // Bytes to follow
        
        $str_error = 0;
        
        if ($strlen > $this->_xls_strmax) { // LABEL must be < 255 chars
            $str = substr($str, 0, $this->_xls_strmax);
            $length = 0x0008 + $this->_xls_strmax;
            $strlen = $this->_xls_strmax;
            $str_error = - 3;
        }
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvv", $row, $col, $xfIndex, $strlen);
        $this->_append($header . $data . $str);
        return ($str_error);
    }

    /**
     * Write a string to the specified row and column (zero indexed).
     * This is the BIFF8 version (no 255 chars limit).
     * $format is optional.
     * Returns 0 : normal termination
     * -2 : row or column out of range
     * -3 : long string truncated to 255 chars
     *
     * @access public
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param string $str
     *            The string to write
     * @param mixed $xfIndex
     *            The XF format index for the cell
     * @return integer
     */
    private function _writeLabelSst($row, $col, $str, $xfIndex)
    {
        $record = 0x00FD; // Record identifier
        $length = 0x000A; // Bytes to follow
        
        $str = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($str);
        
        /* check if string is already present */
        if (! isset($this->_str_table[$str])) {
            $this->_str_table[$str] = $this->_str_unique ++;
        }
        $this->_str_total ++;
        
        $header = pack('vv', $record, $length);
        $data = pack('vvvV', $row, $col, $xfIndex, $this->_str_table[$str]);
        $this->_append($header . $data);
    }

    /**
     * Writes a note associated with the cell given by the row and column.
     * NOTE records don't have a length limit.
     *
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param string $note
     *            The note to write
     */
    private function _writeNote($row, $col, $note)
    {
        $note_length = strlen($note);
        $record = 0x001C; // Record identifier
        $max_length = 2048; // Maximun length for a NOTE record
                             
        // Length for this record is no more than 2048 + 6
        $length = 0x0006 + min($note_length, 2048);
        $header = pack("vv", $record, $length);
        $data = pack("vvv", $row, $col, $note_length);
        $this->_append($header . $data . substr($note, 0, 2048));
        
        for ($i = $max_length; $i < $note_length; $i += $max_length) {
            $chunk = substr($note, $i, $max_length);
            $length = 0x0006 + strlen($chunk);
            $header = pack("vv", $record, $length);
            $data = pack("vvv", - 1, 0, strlen($chunk));
            $this->_append($header . $data . $chunk);
        }
        return (0);
    }

    /**
     * Write a blank cell to the specified row and column (zero indexed).
     * A blank cell is used to specify formatting without adding a string
     * or a number.
     *
     * A blank cell without a format serves no purpose. Therefore, we don't write
     * a BLANK record unless a format is specified.
     *
     * Returns 0 : normal termination (including no format)
     * -1 : insufficient number of arguments
     * -2 : row or column out of range
     *
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param mixed $xfIndex
     *            The XF format index
     */
    function _writeBlank($row, $col, $xfIndex)
    {
        $record = 0x0201; // Record identifier
        $length = 0x0006; // Number of bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("vvv", $row, $col, $xfIndex);
        $this->_append($header . $data);
        return 0;
    }

    /**
     * Write a boolean or an error type to the specified row and column (zero indexed)
     *
     * @param int $row
     *            Row index (0-based)
     * @param int $col
     *            Column index (0-based)
     * @param int $value            
     * @param boolean $isError
     *            Error or Boolean?
     * @param int $xfIndex            
     */
    private function _writeBoolErr($row, $col, $value, $isError, $xfIndex)
    {
        $record = 0x0205;
        $length = 8;
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvCC", $row, $col, $xfIndex, $value, $isError);
        $this->_append($header . $data);
        return 0;
    }

    /**
     * Write a formula to the specified row and column (zero indexed).
     * The textual representation of the formula is passed to the parser in
     * Parser.php which returns a packed binary string.
     *
     * Returns 0 : normal termination
     * -1 : formula errors (bad formula)
     * -2 : row or column out of range
     *
     * @param integer $row
     *            Zero indexed row
     * @param integer $col
     *            Zero indexed column
     * @param string $formula
     *            The formula text string
     * @param mixed $xfIndex
     *            The XF format index
     * @param mixed $calculatedValue
     *            Calculated value
     * @return integer
     */
    private function _writeFormula($row, $col, $formula, $xfIndex, $calculatedValue)
    {
        $record = 0x0006; // Record identifier
                          
        // Initialize possible additional value for STRING record that should be written after the FORMULA record?
        $stringValue = null;
        
        // calculated value
        if (isset($calculatedValue)) {
            // Since we can't yet get the data type of the calculated value,
            // we use best effort to determine data type
            if (is_bool($calculatedValue)) {
                // Boolean value
                $num = pack('CCCvCv', 0x01, 0x00, (int) $calculatedValue, 0x00, 0x00, 0xFFFF);
            } elseif (is_int($calculatedValue) || is_float($calculatedValue)) {
                // Numeric value
                $num = pack('d', $calculatedValue);
            } elseif (is_string($calculatedValue)) {
                if (array_key_exists($calculatedValue, PHPExcel_Cell_DataType::getErrorCodes())) {
                    // Error value
                    $num = pack('CCCvCv', 0x02, 0x00, self::_mapErrorCode($calculatedValue), 0x00, 0x00, 0xFFFF);
                } elseif ($calculatedValue === '') {
                    // Empty string (and BIFF8)
                    $num = pack('CCCvCv', 0x03, 0x00, 0x00, 0x00, 0x00, 0xFFFF);
                } else {
                    // Non-empty string value (or empty string BIFF5)
                    $stringValue = $calculatedValue;
                    $num = pack('CCCvCv', 0x00, 0x00, 0x00, 0x00, 0x00, 0xFFFF);
                }
            } else {
                // We are really not supposed to reach here
                $num = pack('d', 0x00);
            }
        } else {
            $num = pack('d', 0x00);
        }
        
        $grbit = 0x03; // Option flags
        $unknown = 0x0000; // Must be zero
                           
        // Strip the '=' or '@' sign at the beginning of the formula string
        if ($formula{0} == '=') {
            $formula = substr($formula, 1);
        } else {
            // Error handling
            $this->_writeString($row, $col, 'Unrecognised character for formula');
            return - 1;
        }
        
        // Parse the formula using the parser in Parser.php
        try {
            $error = $this->_parser->parse($formula);
            $formula = $this->_parser->toReversePolish();
            
            $formlen = strlen($formula); // Length of the binary string
            $length = 0x16 + $formlen; // Length of the record data
            
            $header = pack("vv", $record, $length);
            
            $data = pack("vvv", $row, $col, $xfIndex) . $num . pack("vVv", $grbit, $unknown, $formlen);
            $this->_append($header . $data . $formula);
            
            // Append also a STRING record if necessary
            if ($stringValue !== null) {
                $this->_writeStringRecord($stringValue);
            }
            
            return 0;
        } catch (PHPExcel_Exception $e) {
            // do nothing
        }
    }

    /**
     * Write a STRING record.
     * This
     *
     * @param string $stringValue            
     */
    private function _writeStringRecord($stringValue)
    {
        $record = 0x0207; // Record identifier
        $data = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($stringValue);
        
        $length = strlen($data);
        $header = pack('vv', $record, $length);
        
        $this->_append($header . $data);
    }

    /**
     * Write a hyperlink.
     * This is comprised of two elements: the visible label and
     * the invisible link. The visible label is the same as the link unless an
     * alternative string is specified. The label is written using the
     * _writeString() method. Therefore the 255 characters string limit applies.
     * $string and $format are optional.
     *
     * The hyperlink can be to a http, ftp, mail, internal sheet (not yet), or external
     * directory url.
     *
     * Returns 0 : normal termination
     * -2 : row or column out of range
     * -3 : long string truncated to 255 chars
     *
     * @param integer $row
     *            Row
     * @param integer $col
     *            Column
     * @param string $url
     *            URL string
     * @return integer
     */
    private function _writeUrl($row, $col, $url)
    {
        // Add start row and col to arg list
        return ($this->_writeUrlRange($row, $col, $row, $col, $url));
    }

    /**
     * This is the more general form of _writeUrl().
     * It allows a hyperlink to be
     * written to a range of cells. This function also decides the type of hyperlink
     * to be written. These are either, Web (http, ftp, mailto), Internal
     * (Sheet1!A1) or external ('c:\temp\foo.xls#Sheet1!A1').
     *
     * @access private
     * @see _writeUrl()
     * @param integer $row1
     *            Start row
     * @param integer $col1
     *            Start column
     * @param integer $row2
     *            End row
     * @param integer $col2
     *            End column
     * @param string $url
     *            URL string
     * @return integer
     */
    function _writeUrlRange($row1, $col1, $row2, $col2, $url)
    {
        // Check for internal/external sheet links or default to web link
        if (preg_match('[^internal:]', $url)) {
            return ($this->_writeUrlInternal($row1, $col1, $row2, $col2, $url));
        }
        if (preg_match('[^external:]', $url)) {
            return ($this->_writeUrlExternal($row1, $col1, $row2, $col2, $url));
        }
        return ($this->_writeUrlWeb($row1, $col1, $row2, $col2, $url));
    }

    /**
     * Used to write http, ftp and mailto hyperlinks.
     * The link type ($options) is 0x03 is the same as absolute dir ref without
     * sheet. However it is differentiated by the $unknown2 data stream.
     *
     * @access private
     * @see _writeUrl()
     * @param integer $row1
     *            Start row
     * @param integer $col1
     *            Start column
     * @param integer $row2
     *            End row
     * @param integer $col2
     *            End column
     * @param string $url
     *            URL string
     * @return integer
     */
    function _writeUrlWeb($row1, $col1, $row2, $col2, $url)
    {
        $record = 0x01B8; // Record identifier
        $length = 0x00000; // Bytes to follow
                             
        // Pack the undocumented parts of the hyperlink stream
        $unknown1 = pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");
        $unknown2 = pack("H*", "E0C9EA79F9BACE118C8200AA004BA90B");
        
        // Pack the option flags
        $options = pack("V", 0x03);
        
        // Convert URL to a null terminated wchar string
        $url = join("\0", preg_split("''", $url, - 1, PREG_SPLIT_NO_EMPTY));
        $url = $url . "\0\0\0";
        
        // Pack the length of the URL
        $url_len = pack("V", strlen($url));
        
        // Calculate the data length
        $length = 0x34 + strlen($url);
        
        // Pack the header data
        $header = pack("vv", $record, $length);
        $data = pack("vvvv", $row1, $row2, $col1, $col2);
        
        // Write the packed data
        $this->_append($header . $data . $unknown1 . $options . $unknown2 . $url_len . $url);
        return 0;
    }

    /**
     * Used to write internal reference hyperlinks such as "Sheet1!A1".
     *
     * @access private
     * @see _writeUrl()
     * @param integer $row1
     *            Start row
     * @param integer $col1
     *            Start column
     * @param integer $row2
     *            End row
     * @param integer $col2
     *            End column
     * @param string $url
     *            URL string
     * @return integer
     */
    function _writeUrlInternal($row1, $col1, $row2, $col2, $url)
    {
        $record = 0x01B8; // Record identifier
        $length = 0x00000; // Bytes to follow
                             
        // Strip URL type
        $url = preg_replace('/^internal:/', '', $url);
        
        // Pack the undocumented parts of the hyperlink stream
        $unknown1 = pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");
        
        // Pack the option flags
        $options = pack("V", 0x08);
        
        // Convert the URL type and to a null terminated wchar string
        $url .= "\0";
        
        // character count
        $url_len = PHPExcel_Shared_String::CountCharacters($url);
        $url_len = pack('V', $url_len);
        
        $url = PHPExcel_Shared_String::ConvertEncoding($url, 'UTF-16LE', 'UTF-8');
        
        // Calculate the data length
        $length = 0x24 + strlen($url);
        
        // Pack the header data
        $header = pack("vv", $record, $length);
        $data = pack("vvvv", $row1, $row2, $col1, $col2);
        
        // Write the packed data
        $this->_append($header . $data . $unknown1 . $options . $url_len . $url);
        return 0;
    }

    /**
     * Write links to external directory names such as 'c:\foo.xls',
     * c:\foo.xls#Sheet1!A1', '../../foo.xls'.
     * and '../../foo.xls#Sheet1!A1'.
     *
     * Note: Excel writes some relative links with the $dir_long string. We ignore
     * these cases for the sake of simpler code.
     *
     * @access private
     * @see _writeUrl()
     * @param integer $row1
     *            Start row
     * @param integer $col1
     *            Start column
     * @param integer $row2
     *            End row
     * @param integer $col2
     *            End column
     * @param string $url
     *            URL string
     * @return integer
     */
    function _writeUrlExternal($row1, $col1, $row2, $col2, $url)
    {
        // Network drives are different. We will handle them separately
        // MS/Novell network drives and shares start with \\
        if (preg_match('[^external:\\\\]', $url)) {
            return; // ($this->_writeUrlExternal_net($row1, $col1, $row2, $col2, $url, $str, $format));
        }
        
        $record = 0x01B8; // Record identifier
        $length = 0x00000; // Bytes to follow
                             
        // Strip URL type and change Unix dir separator to Dos style (if needed)
                             //
        $url = preg_replace('/^external:/', '', $url);
        $url = preg_replace('/\//', "\\", $url);
        
        // Determine if the link is relative or absolute:
        // relative if link contains no dir separator, "somefile.xls"
        // relative if link starts with up-dir, "..\..\somefile.xls"
        // otherwise, absolute
        
        $absolute = 0x00; // relative path
        if (preg_match('/^[A-Z]:/', $url)) {
            $absolute = 0x02; // absolute path on Windows, e.g. C:\...
        }
        $link_type = 0x01 | $absolute;
        
        // Determine if the link contains a sheet reference and change some of the
        // parameters accordingly.
        // Split the dir name and sheet name (if it exists)
        $dir_long = $url;
        if (preg_match("/\#/", $url)) {
            $link_type |= 0x08;
        }
        
        // Pack the link type
        $link_type = pack("V", $link_type);
        
        // Calculate the up-level dir count e.g.. (..\..\..\ == 3)
        $up_count = preg_match_all("/\.\.\\\/", $dir_long, $useless);
        $up_count = pack("v", $up_count);
        
        // Store the short dos dir name (null terminated)
        $dir_short = preg_replace("/\.\.\\\/", '', $dir_long) . "\0";
        
        // Store the long dir name as a wchar string (non-null terminated)
        $dir_long = $dir_long . "\0";
        
        // Pack the lengths of the dir strings
        $dir_short_len = pack("V", strlen($dir_short));
        $dir_long_len = pack("V", strlen($dir_long));
        $stream_len = pack("V", 0); // strlen($dir_long) + 0x06);
                                    
        // Pack the undocumented parts of the hyperlink stream
        $unknown1 = pack("H*", 'D0C9EA79F9BACE118C8200AA004BA90B02000000');
        $unknown2 = pack("H*", '0303000000000000C000000000000046');
        $unknown3 = pack("H*", 'FFFFADDE000000000000000000000000000000000000000');
        $unknown4 = pack("v", 0x03);
        
        // Pack the main data stream
        $data = pack("vvvv", $row1, $row2, $col1, $col2) . $unknown1 . $link_type . $unknown2 . $up_count . $dir_short_len . $dir_short . $unknown3 . $stream_len; /*
                         * .
                         * $dir_long_len .
                         * $unknown4 .
                         * $dir_long .
                         * $sheet_len .
                         * $sheet ;
                         */
        
        // Pack the header data
        $length = strlen($data);
        $header = pack("vv", $record, $length);
        
        // Write the packed data
        $this->_append($header . $data);
        return 0;
    }

    /**
     * This method is used to set the height and format for a row.
     *
     * @param integer $row
     *            The row to set
     * @param integer $height
     *            Height we are giving to the row.
     *            Use null to set XF without setting height
     * @param integer $xfIndex
     *            The optional cell style Xf index to apply to the columns
     * @param bool $hidden
     *            The optional hidden attribute
     * @param integer $level
     *            The optional outline level for row, in range [0,7]
     */
    private function _writeRow($row, $height, $xfIndex, $hidden = false, $level = 0)
    {
        $record = 0x0208; // Record identifier
        $length = 0x0010; // Number of bytes to follow
        
        $colMic = 0x0000; // First defined column
        $colMac = 0x0000; // Last defined column
        $irwMac = 0x0000; // Used by Excel to optimise loading
        $reserved = 0x0000; // Reserved
        $grbit = 0x0000; // Option flags
        $ixfe = $xfIndex;
        
        if ($height < 0) {
            $height = null;
        }
        
        // Use _writeRow($row, null, $XF) to set XF format without setting height
        if ($height != null) {
            $miyRw = $height * 20; // row height
        } else {
            $miyRw = 0xff; // default row height is 256
        }
        
        // Set the options flags. fUnsynced is used to show that the font and row
        // heights are not compatible. This is usually the case for WriteExcel.
        // The collapsed flag 0x10 doesn't seem to be used to indicate that a row
        // is collapsed. Instead it is used to indicate that the previous row is
        // collapsed. The zero height flag, 0x20, is used to collapse a row.
        
        $grbit |= $level;
        if ($hidden) {
            $grbit |= 0x0020;
        }
        if ($height !== null) {
            $grbit |= 0x0040; // fUnsynced
        }
        if ($xfIndex !== 0xF) {
            $grbit |= 0x0080;
        }
        $grbit |= 0x0100;
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvvvvvv", $row, $colMic, $colMac, $miyRw, $irwMac, $reserved, $grbit, $ixfe);
        $this->_append($header . $data);
    }

    /**
     * Writes Excel DIMENSIONS to define the area in which there is data.
     */
    private function _writeDimensions()
    {
        $record = 0x0200; // Record identifier
        
        $length = 0x000E;
        $data = pack('VVvvv', $this->_firstRowIndex, $this->_lastRowIndex + 1, $this->_firstColumnIndex, $this->_lastColumnIndex + 1, 0x0000) // reserved
;
        
        $header = pack("vv", $record, $length);
        $this->_append($header . $data);
    }

    /**
     * Write BIFF record Window2.
     */
    private function _writeWindow2()
    {
        $record = 0x023E; // Record identifier
        $length = 0x0012;
        
        $grbit = 0x00B6; // Option flags
        $rwTop = 0x0000; // Top row visible in window
        $colLeft = 0x0000; // Leftmost column visible in window
                            
        // The options flags that comprise $grbit
        $fDspFmla = 0; // 0 - bit
        $fDspGrid = $this->_phpSheet->getShowGridlines() ? 1 : 0; // 1
        $fDspRwCol = $this->_phpSheet->getShowRowColHeaders() ? 1 : 0; // 2
        $fFrozen = $this->_phpSheet->getFreezePane() ? 1 : 0; // 3
        $fDspZeros = 1; // 4
        $fDefaultHdr = 1; // 5
        $fArabic = $this->_phpSheet->getRightToLeft() ? 1 : 0; // 6
        $fDspGuts = $this->_outline_on; // 7
        $fFrozenNoSplit = 0; // 0 - bit
                             // no support in PHPExcel for selected sheet, therefore sheet is only selected if it is the active sheet
        $fSelected = ($this->_phpSheet === $this->_phpSheet->getParent()->getActiveSheet()) ? 1 : 0;
        $fPaged = 1; // 2
        $fPageBreakPreview = $this->_phpSheet->getSheetView()->getView() === PHPExcel_Worksheet_SheetView::SHEETVIEW_PAGE_BREAK_PREVIEW;
        
        $grbit = $fDspFmla;
        $grbit |= $fDspGrid << 1;
        $grbit |= $fDspRwCol << 2;
        $grbit |= $fFrozen << 3;
        $grbit |= $fDspZeros << 4;
        $grbit |= $fDefaultHdr << 5;
        $grbit |= $fArabic << 6;
        $grbit |= $fDspGuts << 7;
        $grbit |= $fFrozenNoSplit << 8;
        $grbit |= $fSelected << 9;
        $grbit |= $fPaged << 10;
        $grbit |= $fPageBreakPreview << 11;
        
        $header = pack("vv", $record, $length);
        $data = pack("vvv", $grbit, $rwTop, $colLeft);
        
        // FIXME !!!
        $rgbHdr = 0x0040; // Row/column heading and gridline color index
        $zoom_factor_page_break = ($fPageBreakPreview ? $this->_phpSheet->getSheetView()->getZoomScale() : 0x0000);
        $zoom_factor_normal = $this->_phpSheet->getSheetView()->getZoomScaleNormal();
        
        $data .= pack("vvvvV", $rgbHdr, 0x0000, $zoom_factor_page_break, $zoom_factor_normal, 0x00000000);
        
        $this->_append($header . $data);
    }

    /**
     * Write BIFF record DEFAULTROWHEIGHT.
     */
    private function _writeDefaultRowHeight()
    {
        $defaultRowHeight = $this->_phpSheet->getDefaultRowDimension()->getRowHeight();
        
        if ($defaultRowHeight < 0) {
            return;
        }
        
        // convert to twips
        $defaultRowHeight = (int) 20 * $defaultRowHeight;
        
        $record = 0x0225; // Record identifier
        $length = 0x0004; // Number of bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("vv", 1, $defaultRowHeight);
        $this->_append($header . $data);
    }

    /**
     * Write BIFF record DEFCOLWIDTH if COLINFO records are in use.
     */
    private function _writeDefcol()
    {
        $defaultColWidth = 8;
        
        $record = 0x0055; // Record identifier
        $length = 0x0002; // Number of bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $defaultColWidth);
        $this->_append($header . $data);
    }

    /**
     * Write BIFF record COLINFO to define column widths
     *
     * Note: The SDK says the record length is 0x0B but Excel writes a 0x0C
     * length record.
     *
     * @param array $col_array
     *            This is the only parameter received and is composed of the following:
     *            0 => First formatted column,
     *            1 => Last formatted column,
     *            2 => Col width (8.43 is Excel default),
     *            3 => The optional XF format of the column,
     *            4 => Option flags.
     *            5 => Optional outline level
     */
    private function _writeColinfo($col_array)
    {
        if (isset($col_array[0])) {
            $colFirst = $col_array[0];
        }
        if (isset($col_array[1])) {
            $colLast = $col_array[1];
        }
        if (isset($col_array[2])) {
            $coldx = $col_array[2];
        } else {
            $coldx = 8.43;
        }
        if (isset($col_array[3])) {
            $xfIndex = $col_array[3];
        } else {
            $xfIndex = 15;
        }
        if (isset($col_array[4])) {
            $grbit = $col_array[4];
        } else {
            $grbit = 0;
        }
        if (isset($col_array[5])) {
            $level = $col_array[5];
        } else {
            $level = 0;
        }
        $record = 0x007D; // Record identifier
        $length = 0x000C; // Number of bytes to follow
        
        $coldx *= 256; // Convert to units of 1/256 of a char
        
        $ixfe = $xfIndex;
        $reserved = 0x0000; // Reserved
        
        $level = max(0, min($level, 7));
        $grbit |= $level << 8;
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvvvv", $colFirst, $colLast, $coldx, $ixfe, $grbit, $reserved);
        $this->_append($header . $data);
    }

    /**
     * Write BIFF record SELECTION.
     */
    private function _writeSelection()
    {
        // look up the selected cell range
        $selectedCells = $this->_phpSheet->getSelectedCells();
        $selectedCells = PHPExcel_Cell::splitRange($this->_phpSheet->getSelectedCells());
        $selectedCells = $selectedCells[0];
        if (count($selectedCells) == 2) {
            list ($first, $last) = $selectedCells;
        } else {
            $first = $selectedCells[0];
            $last = $selectedCells[0];
        }
        
        list ($colFirst, $rwFirst) = PHPExcel_Cell::coordinateFromString($first);
        $colFirst = PHPExcel_Cell::columnIndexFromString($colFirst) - 1; // base 0 column index
        -- $rwFirst; // base 0 row index
        
        list ($colLast, $rwLast) = PHPExcel_Cell::coordinateFromString($last);
        $colLast = PHPExcel_Cell::columnIndexFromString($colLast) - 1; // base 0 column index
        -- $rwLast; // base 0 row index
                   
        // make sure we are not out of bounds
        $colFirst = min($colFirst, 255);
        $colLast = min($colLast, 255);
        
        $rwFirst = min($rwFirst, 65535);
        $rwLast = min($rwLast, 65535);
        
        $record = 0x001D; // Record identifier
        $length = 0x000F; // Number of bytes to follow
        
        $pnn = $this->_active_pane; // Pane position
        $rwAct = $rwFirst; // Active row
        $colAct = $colFirst; // Active column
        $irefAct = 0; // Active cell ref
        $cref = 1; // Number of refs
        
        if (! isset($rwLast)) {
            $rwLast = $rwFirst; // Last row in reference
        }
        if (! isset($colLast)) {
            $colLast = $colFirst; // Last col in reference
        }
        
        // Swap last row/col for first row/col as necessary
        if ($rwFirst > $rwLast) {
            list ($rwFirst, $rwLast) = array(
                $rwLast,
                $rwFirst
            );
        }
        
        if ($colFirst > $colLast) {
            list ($colFirst, $colLast) = array(
                $colLast,
                $colFirst
            );
        }
        
        $header = pack("vv", $record, $length);
        $data = pack("CvvvvvvCC", $pnn, $rwAct, $colAct, $irefAct, $cref, $rwFirst, $rwLast, $colFirst, $colLast);
        $this->_append($header . $data);
    }

    /**
     * Store the MERGEDCELLS records for all ranges of merged cells
     */
    private function _writeMergedCells()
    {
        $mergeCells = $this->_phpSheet->getMergeCells();
        $countMergeCells = count($mergeCells);
        
        if ($countMergeCells == 0) {
            return;
        }
        
        // maximum allowed number of merged cells per record
        $maxCountMergeCellsPerRecord = 1027;
        
        // record identifier
        $record = 0x00E5;
        
        // counter for total number of merged cells treated so far by the writer
        $i = 0;
        
        // counter for number of merged cells written in record currently being written
        $j = 0;
        
        // initialize record data
        $recordData = '';
        
        // loop through the merged cells
        foreach ($mergeCells as $mergeCell) {
            ++ $i;
            ++ $j;
            
            // extract the row and column indexes
            $range = PHPExcel_Cell::splitRange($mergeCell);
            list ($first, $last) = $range[0];
            list ($firstColumn, $firstRow) = PHPExcel_Cell::coordinateFromString($first);
            list ($lastColumn, $lastRow) = PHPExcel_Cell::coordinateFromString($last);
            
            $recordData .= pack('vvvv', $firstRow - 1, $lastRow - 1, PHPExcel_Cell::columnIndexFromString($firstColumn) - 1, PHPExcel_Cell::columnIndexFromString($lastColumn) - 1);
            
            // flush record if we have reached limit for number of merged cells, or reached final merged cell
            if ($j == $maxCountMergeCellsPerRecord or $i == $countMergeCells) {
                $recordData = pack('v', $j) . $recordData;
                $length = strlen($recordData);
                $header = pack('vv', $record, $length);
                $this->_append($header . $recordData);
                
                // initialize for next record, if any
                $recordData = '';
                $j = 0;
            }
        }
    }

    /**
     * Write SHEETLAYOUT record
     */
    private function _writeSheetLayout()
    {
        if (! $this->_phpSheet->isTabColorSet()) {
            return;
        }
        
        $recordData = pack('vvVVVvv', 0x0862, 0x0000, // unused
0x00000000, // unused
0x00000000, // unused
0x00000014, // size of record data
$this->_colors[$this->_phpSheet->getTabColor()->getRGB()], // color index
0x0000) // unused
;
        
        $length = strlen($recordData);
        
        $record = 0x0862; // Record identifier
        $header = pack('vv', $record, $length);
        $this->_append($header . $recordData);
    }

    /**
     * Write SHEETPROTECTION
     */
    private function _writeSheetProtection()
    {
        // record identifier
        $record = 0x0867;
        
        // prepare options
        $options = (int) ! $this->_phpSheet->getProtection()->getObjects() | (int) ! $this->_phpSheet->getProtection()->getScenarios() << 1 | (int) ! $this->_phpSheet->getProtection()->getFormatCells() << 2 | (int) ! $this->_phpSheet->getProtection()->getFormatColumns() << 3 | (int) ! $this->_phpSheet->getProtection()->getFormatRows() << 4 | (int) ! $this->_phpSheet->getProtection()->getInsertColumns() << 5 | (int) ! $this->_phpSheet->getProtection()->getInsertRows() << 6 | (int) ! $this->_phpSheet->getProtection()->getInsertHyperlinks() << 7 | (int) ! $this->_phpSheet->getProtection()->getDeleteColumns() << 8 | (int) ! $this->_phpSheet->getProtection()->getDeleteRows() << 9 | (int) ! $this->_phpSheet->getProtection()->getSelectLockedCells() << 10 | (int) ! $this->_phpSheet->getProtection()->getSort() << 11 | (int) ! $this->_phpSheet->getProtection()->getAutoFilter() << 12 | (int) ! $this->_phpSheet->getProtection()->getPivotTables() << 13 | (int) ! $this->_phpSheet->getProtection()->getSelectUnlockedCells() << 14;
        
        // record data
        $recordData = pack('vVVCVVvv', 0x0867, // repeated record identifier
0x0000, // not used
0x0000, // not used
0x00, // not used
0x01000200, // unknown data
0xFFFFFFFF, // unknown data
$options, // options
0x0000) // not used
;
        
        $length = strlen($recordData);
        $header = pack('vv', $record, $length);
        
        $this->_append($header . $recordData);
    }

    /**
     * Write BIFF record RANGEPROTECTION
     *
     * Openoffice.org's Documentaion of the Microsoft Excel File Format uses term RANGEPROTECTION for these records
     * Microsoft Office Excel 97-2007 Binary File Format Specification uses term FEAT for these records
     */
    private function _writeRangeProtection()
    {
        foreach ($this->_phpSheet->getProtectedCells() as $range => $password) {
            // number of ranges, e.g. 'A1:B3 C20:D25'
            $cellRanges = explode(' ', $range);
            $cref = count($cellRanges);
            
            $recordData = pack('vvVVvCVvVv', 0x0868, 0x00, 0x0000, 0x0000, 0x02, 0x0, 0x0000, $cref, 0x0000, 0x00);
            
            foreach ($cellRanges as $cellRange) {
                $recordData .= $this->_writeBIFF8CellRangeAddressFixed($cellRange);
            }
            
            // the rgbFeat structure
            $recordData .= pack('VV', 0x0000, hexdec($password));
            
            $recordData .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong('p' . md5($recordData));
            
            $length = strlen($recordData);
            
            $record = 0x0868; // Record identifier
            $header = pack("vv", $record, $length);
            $this->_append($header . $recordData);
        }
    }

    /**
     * Write BIFF record EXTERNCOUNT to indicate the number of external sheet
     * references in a worksheet.
     *
     * Excel only stores references to external sheets that are used in formulas.
     * For simplicity we store references to all the sheets in the workbook
     * regardless of whether they are used or not. This reduces the overall
     * complexity and eliminates the need for a two way dialogue between the formula
     * parser the worksheet objects.
     *
     * @param integer $count
     *            The number of external sheet references in this worksheet
     */
    private function _writeExterncount($count)
    {
        $record = 0x0016; // Record identifier
        $length = 0x0002; // Number of bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $count);
        $this->_append($header . $data);
    }

    /**
     * Writes the Excel BIFF EXTERNSHEET record.
     * These references are used by
     * formulas. A formula references a sheet name via an index. Since we store a
     * reference to all of the external worksheets the EXTERNSHEET index is the same
     * as the worksheet index.
     *
     * @param string $sheetname
     *            The name of a external worksheet
     */
    private function _writeExternsheet($sheetname)
    {
        $record = 0x0017; // Record identifier
                          
        // References to the current sheet are encoded differently to references to
                          // external sheets.
                          //
        if ($this->_phpSheet->getTitle() == $sheetname) {
            $sheetname = '';
            $length = 0x02; // The following 2 bytes
            $cch = 1; // The following byte
            $rgch = 0x02; // Self reference
        } else {
            $length = 0x02 + strlen($sheetname);
            $cch = strlen($sheetname);
            $rgch = 0x03; // Reference to a sheet in the current workbook
        }
        
        $header = pack("vv", $record, $length);
        $data = pack("CC", $cch, $rgch);
        $this->_append($header . $data . $sheetname);
    }

    /**
     * Writes the Excel BIFF PANE record.
     * The panes can either be frozen or thawed (unfrozen).
     * Frozen panes are specified in terms of an integer number of rows and columns.
     * Thawed panes are specified in terms of Excel's units for rows and columns.
     */
    private function _writePanes()
    {
        $panes = array();
        if ($freezePane = $this->_phpSheet->getFreezePane()) {
            list ($column, $row) = PHPExcel_Cell::coordinateFromString($freezePane);
            $panes[0] = $row - 1;
            $panes[1] = PHPExcel_Cell::columnIndexFromString($column) - 1;
        } else {
            // thaw panes
            return;
        }
        
        $y = isset($panes[0]) ? $panes[0] : null;
        $x = isset($panes[1]) ? $panes[1] : null;
        $rwTop = isset($panes[2]) ? $panes[2] : null;
        $colLeft = isset($panes[3]) ? $panes[3] : null;
        if (count($panes) > 4) { // if Active pane was received
            $pnnAct = $panes[4];
        } else {
            $pnnAct = null;
        }
        $record = 0x0041; // Record identifier
        $length = 0x000A; // Number of bytes to follow
                           
        // Code specific to frozen or thawed panes.
        if ($this->_phpSheet->getFreezePane()) {
            // Set default values for $rwTop and $colLeft
            if (! isset($rwTop)) {
                $rwTop = $y;
            }
            if (! isset($colLeft)) {
                $colLeft = $x;
            }
        } else {
            // Set default values for $rwTop and $colLeft
            if (! isset($rwTop)) {
                $rwTop = 0;
            }
            if (! isset($colLeft)) {
                $colLeft = 0;
            }
            
            // Convert Excel's row and column units to the internal units.
            // The default row height is 12.75
            // The default column width is 8.43
            // The following slope and intersection values were interpolated.
            //
            $y = 20 * $y + 255;
            $x = 113.879 * $x + 390;
        }
        
        // Determine which pane should be active. There is also the undocumented
        // option to override this should it be necessary: may be removed later.
        //
        if (! isset($pnnAct)) {
            if ($x != 0 && $y != 0) {
                $pnnAct = 0; // Bottom right
            }
            if ($x != 0 && $y == 0) {
                $pnnAct = 1; // Top right
            }
            if ($x == 0 && $y != 0) {
                $pnnAct = 2; // Bottom left
            }
            if ($x == 0 && $y == 0) {
                $pnnAct = 3; // Top left
            }
        }
        
        $this->_active_pane = $pnnAct; // Used in _writeSelection
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvvv", $x, $y, $rwTop, $colLeft, $pnnAct);
        $this->_append($header . $data);
    }

    /**
     * Store the page setup SETUP BIFF record.
     */
    private function _writeSetup()
    {
        $record = 0x00A1; // Record identifier
        $length = 0x0022; // Number of bytes to follow
        
        $iPaperSize = $this->_phpSheet->getPageSetup()->getPaperSize(); // Paper size
        
        $iScale = $this->_phpSheet->getPageSetup()->getScale() ? $this->_phpSheet->getPageSetup()->getScale() : 100; // Print scaling factor
        
        $iPageStart = 0x01; // Starting page number
        $iFitWidth = (int) $this->_phpSheet->getPageSetup()->getFitToWidth(); // Fit to number of pages wide
        $iFitHeight = (int) $this->_phpSheet->getPageSetup()->getFitToHeight(); // Fit to number of pages high
        $grbit = 0x00; // Option flags
        $iRes = 0x0258; // Print resolution
        $iVRes = 0x0258; // Vertical print resolution
        
        $numHdr = $this->_phpSheet->getPageMargins()->getHeader(); // Header Margin
        
        $numFtr = $this->_phpSheet->getPageMargins()->getFooter(); // Footer Margin
        $iCopies = 0x01; // Number of copies
        
        $fLeftToRight = 0x0; // Print over then down
                             
        // Page orientation
        $fLandscape = ($this->_phpSheet->getPageSetup()->getOrientation() == PHPExcel_Worksheet_PageSetup::ORIENTATION_LANDSCAPE) ? 0x0 : 0x1;
        
        $fNoPls = 0x0; // Setup not read from printer
        $fNoColor = 0x0; // Print black and white
        $fDraft = 0x0; // Print draft quality
        $fNotes = 0x0; // Print notes
        $fNoOrient = 0x0; // Orientation not set
        $fUsePage = 0x0; // Use custom starting page
        
        $grbit = $fLeftToRight;
        $grbit |= $fLandscape << 1;
        $grbit |= $fNoPls << 2;
        $grbit |= $fNoColor << 3;
        $grbit |= $fDraft << 4;
        $grbit |= $fNotes << 5;
        $grbit |= $fNoOrient << 6;
        $grbit |= $fUsePage << 7;
        
        $numHdr = pack("d", $numHdr);
        $numFtr = pack("d", $numFtr);
        if (self::getByteOrder()) { // if it's Big Endian
            $numHdr = strrev($numHdr);
            $numFtr = strrev($numFtr);
        }
        
        $header = pack("vv", $record, $length);
        $data1 = pack("vvvvvvvv", $iPaperSize, $iScale, $iPageStart, $iFitWidth, $iFitHeight, $grbit, $iRes, $iVRes);
        $data2 = $numHdr . $numFtr;
        $data3 = pack("v", $iCopies);
        $this->_append($header . $data1 . $data2 . $data3);
    }

    /**
     * Store the header caption BIFF record.
     */
    private function _writeHeader()
    {
        $record = 0x0014; // Record identifier
        
        /*
         * removing for now
         * // need to fix character count (multibyte!)
         * if (strlen($this->_phpSheet->getHeaderFooter()->getOddHeader()) <= 255) {
         * $str = $this->_phpSheet->getHeaderFooter()->getOddHeader(); // header string
         * } else {
         * $str = '';
         * }
         */
        
        $recordData = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($this->_phpSheet->getHeaderFooter()->getOddHeader());
        $length = strlen($recordData);
        
        $header = pack("vv", $record, $length);
        
        $this->_append($header . $recordData);
    }

    /**
     * Store the footer caption BIFF record.
     */
    private function _writeFooter()
    {
        $record = 0x0015; // Record identifier
        
        /*
         * removing for now
         * // need to fix character count (multibyte!)
         * if (strlen($this->_phpSheet->getHeaderFooter()->getOddFooter()) <= 255) {
         * $str = $this->_phpSheet->getHeaderFooter()->getOddFooter();
         * } else {
         * $str = '';
         * }
         */
        
        $recordData = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($this->_phpSheet->getHeaderFooter()->getOddFooter());
        $length = strlen($recordData);
        
        $header = pack("vv", $record, $length);
        
        $this->_append($header . $recordData);
    }

    /**
     * Store the horizontal centering HCENTER BIFF record.
     *
     * @access private
     */
    private function _writeHcenter()
    {
        $record = 0x0083; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fHCenter = $this->_phpSheet->getPageSetup()->getHorizontalCentered() ? 1 : 0; // Horizontal centering
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fHCenter);
        
        $this->_append($header . $data);
    }

    /**
     * Store the vertical centering VCENTER BIFF record.
     */
    private function _writeVcenter()
    {
        $record = 0x0084; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fVCenter = $this->_phpSheet->getPageSetup()->getVerticalCentered() ? 1 : 0; // Horizontal centering
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fVCenter);
        $this->_append($header . $data);
    }

    /**
     * Store the LEFTMARGIN BIFF record.
     */
    private function _writeMarginLeft()
    {
        $record = 0x0026; // Record identifier
        $length = 0x0008; // Bytes to follow
        
        $margin = $this->_phpSheet->getPageMargins()->getLeft(); // Margin in inches
        
        $header = pack("vv", $record, $length);
        $data = pack("d", $margin);
        if (self::getByteOrder()) { // if it's Big Endian
            $data = strrev($data);
        }
        
        $this->_append($header . $data);
    }

    /**
     * Store the RIGHTMARGIN BIFF record.
     */
    private function _writeMarginRight()
    {
        $record = 0x0027; // Record identifier
        $length = 0x0008; // Bytes to follow
        
        $margin = $this->_phpSheet->getPageMargins()->getRight(); // Margin in inches
        
        $header = pack("vv", $record, $length);
        $data = pack("d", $margin);
        if (self::getByteOrder()) { // if it's Big Endian
            $data = strrev($data);
        }
        
        $this->_append($header . $data);
    }

    /**
     * Store the TOPMARGIN BIFF record.
     */
    private function _writeMarginTop()
    {
        $record = 0x0028; // Record identifier
        $length = 0x0008; // Bytes to follow
        
        $margin = $this->_phpSheet->getPageMargins()->getTop(); // Margin in inches
        
        $header = pack("vv", $record, $length);
        $data = pack("d", $margin);
        if (self::getByteOrder()) { // if it's Big Endian
            $data = strrev($data);
        }
        
        $this->_append($header . $data);
    }

    /**
     * Store the BOTTOMMARGIN BIFF record.
     */
    private function _writeMarginBottom()
    {
        $record = 0x0029; // Record identifier
        $length = 0x0008; // Bytes to follow
        
        $margin = $this->_phpSheet->getPageMargins()->getBottom(); // Margin in inches
        
        $header = pack("vv", $record, $length);
        $data = pack("d", $margin);
        if (self::getByteOrder()) { // if it's Big Endian
            $data = strrev($data);
        }
        
        $this->_append($header . $data);
    }

    /**
     * Write the PRINTHEADERS BIFF record.
     */
    private function _writePrintHeaders()
    {
        $record = 0x002a; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fPrintRwCol = $this->_print_headers; // Boolean flag
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fPrintRwCol);
        $this->_append($header . $data);
    }

    /**
     * Write the PRINTGRIDLINES BIFF record.
     * Must be used in conjunction with the
     * GRIDSET record.
     */
    private function _writePrintGridlines()
    {
        $record = 0x002b; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fPrintGrid = $this->_phpSheet->getPrintGridlines() ? 1 : 0; // Boolean flag
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fPrintGrid);
        $this->_append($header . $data);
    }

    /**
     * Write the GRIDSET BIFF record.
     * Must be used in conjunction with the
     * PRINTGRIDLINES record.
     */
    private function _writeGridset()
    {
        $record = 0x0082; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fGridSet = ! $this->_phpSheet->getPrintGridlines(); // Boolean flag
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fGridSet);
        $this->_append($header . $data);
    }

    /**
     * Write the AUTOFILTERINFO BIFF record.
     * This is used to configure the number of autofilter select used in the sheet.
     */
    private function _writeAutoFilterInfo()
    {
        $record = 0x009D; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $rangeBounds = PHPExcel_Cell::rangeBoundaries($this->_phpSheet->getAutoFilter()->getRange());
        $iNumFilters = 1 + $rangeBounds[1][0] - $rangeBounds[0][0];
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $iNumFilters);
        $this->_append($header . $data);
    }

    /**
     * Write the GUTS BIFF record.
     * This is used to configure the gutter margins
     * where Excel outline symbols are displayed. The visibility of the gutters is
     * controlled by a flag in WSBOOL.
     *
     * @see _writeWsbool()
     */
    private function _writeGuts()
    {
        $record = 0x0080; // Record identifier
        $length = 0x0008; // Bytes to follow
        
        $dxRwGut = 0x0000; // Size of row gutter
        $dxColGut = 0x0000; // Size of col gutter
                            
        // determine maximum row outline level
        $maxRowOutlineLevel = 0;
        foreach ($this->_phpSheet->getRowDimensions() as $rowDimension) {
            $maxRowOutlineLevel = max($maxRowOutlineLevel, $rowDimension->getOutlineLevel());
        }
        
        $col_level = 0;
        
        // Calculate the maximum column outline level. The equivalent calculation
        // for the row outline level is carried out in _writeRow().
        $colcount = count($this->_colinfo);
        for ($i = 0; $i < $colcount; ++ $i) {
            $col_level = max($this->_colinfo[$i][5], $col_level);
        }
        
        // Set the limits for the outline levels (0 <= x <= 7).
        $col_level = max(0, min($col_level, 7));
        
        // The displayed level is one greater than the max outline levels
        if ($maxRowOutlineLevel) {
            ++ $maxRowOutlineLevel;
        }
        if ($col_level) {
            ++ $col_level;
        }
        
        $header = pack("vv", $record, $length);
        $data = pack("vvvv", $dxRwGut, $dxColGut, $maxRowOutlineLevel, $col_level);
        
        $this->_append($header . $data);
    }

    /**
     * Write the WSBOOL BIFF record, mainly for fit-to-page.
     * Used in conjunction
     * with the SETUP record.
     */
    private function _writeWsbool()
    {
        $record = 0x0081; // Record identifier
        $length = 0x0002; // Bytes to follow
        $grbit = 0x0000;
        
        // The only option that is of interest is the flag for fit to page. So we
        // set all the options in one go.
        //
        // Set the option flags
        $grbit |= 0x0001; // Auto page breaks visible
        if ($this->_outline_style) {
            $grbit |= 0x0020; // Auto outline styles
        }
        if ($this->_phpSheet->getShowSummaryBelow()) {
            $grbit |= 0x0040; // Outline summary below
        }
        if ($this->_phpSheet->getShowSummaryRight()) {
            $grbit |= 0x0080; // Outline summary right
        }
        if ($this->_phpSheet->getPageSetup()->getFitToPage()) {
            $grbit |= 0x0100; // Page setup fit to page
        }
        if ($this->_outline_on) {
            $grbit |= 0x0400; // Outline symbols displayed
        }
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $grbit);
        $this->_append($header . $data);
    }

    /**
     * Write the HORIZONTALPAGEBREAKS and VERTICALPAGEBREAKS BIFF records.
     */
    private function _writeBreaks()
    {
        // initialize
        $vbreaks = array();
        $hbreaks = array();
        
        foreach ($this->_phpSheet->getBreaks() as $cell => $breakType) {
            // Fetch coordinates
            $coordinates = PHPExcel_Cell::coordinateFromString($cell);
            
            // Decide what to do by the type of break
            switch ($breakType) {
                case PHPExcel_Worksheet::BREAK_COLUMN:
                    // Add to list of vertical breaks
                    $vbreaks[] = PHPExcel_Cell::columnIndexFromString($coordinates[0]) - 1;
                    break;
                
                case PHPExcel_Worksheet::BREAK_ROW:
                    // Add to list of horizontal breaks
                    $hbreaks[] = $coordinates[1];
                    break;
                
                case PHPExcel_Worksheet::BREAK_NONE:
                default:
                    // Nothing to do
                    break;
            }
        }
        
        // horizontal page breaks
        if (! empty($hbreaks)) {
            
            // Sort and filter array of page breaks
            sort($hbreaks, SORT_NUMERIC);
            if ($hbreaks[0] == 0) { // don't use first break if it's 0
                array_shift($hbreaks);
            }
            
            $record = 0x001b; // Record identifier
            $cbrk = count($hbreaks); // Number of page breaks
            $length = 2 + 6 * $cbrk; // Bytes to follow
            
            $header = pack("vv", $record, $length);
            $data = pack("v", $cbrk);
            
            // Append each page break
            foreach ($hbreaks as $hbreak) {
                $data .= pack("vvv", $hbreak, 0x0000, 0x00ff);
            }
            
            $this->_append($header . $data);
        }
        
        // vertical page breaks
        if (! empty($vbreaks)) {
            
            // 1000 vertical pagebreaks appears to be an internal Excel 5 limit.
            // It is slightly higher in Excel 97/200, approx. 1026
            $vbreaks = array_slice($vbreaks, 0, 1000);
            
            // Sort and filter array of page breaks
            sort($vbreaks, SORT_NUMERIC);
            if ($vbreaks[0] == 0) { // don't use first break if it's 0
                array_shift($vbreaks);
            }
            
            $record = 0x001a; // Record identifier
            $cbrk = count($vbreaks); // Number of page breaks
            $length = 2 + 6 * $cbrk; // Bytes to follow
            
            $header = pack("vv", $record, $length);
            $data = pack("v", $cbrk);
            
            // Append each page break
            foreach ($vbreaks as $vbreak) {
                $data .= pack("vvv", $vbreak, 0x0000, 0xffff);
            }
            
            $this->_append($header . $data);
        }
    }

    /**
     * Set the Biff PROTECT record to indicate that the worksheet is protected.
     */
    private function _writeProtect()
    {
        // Exit unless sheet protection has been specified
        if (! $this->_phpSheet->getProtection()->getSheet()) {
            return;
        }
        
        $record = 0x0012; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $fLock = 1; // Worksheet is protected
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $fLock);
        
        $this->_append($header . $data);
    }

    /**
     * Write SCENPROTECT
     */
    private function _writeScenProtect()
    {
        // Exit if sheet protection is not active
        if (! $this->_phpSheet->getProtection()->getSheet()) {
            return;
        }
        
        // Exit if scenarios are not protected
        if (! $this->_phpSheet->getProtection()->getScenarios()) {
            return;
        }
        
        $record = 0x00DD; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $header = pack('vv', $record, $length);
        $data = pack('v', 1);
        
        $this->_append($header . $data);
    }

    /**
     * Write OBJECTPROTECT
     */
    private function _writeObjectProtect()
    {
        // Exit if sheet protection is not active
        if (! $this->_phpSheet->getProtection()->getSheet()) {
            return;
        }
        
        // Exit if objects are not protected
        if (! $this->_phpSheet->getProtection()->getObjects()) {
            return;
        }
        
        $record = 0x0063; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $header = pack('vv', $record, $length);
        $data = pack('v', 1);
        
        $this->_append($header . $data);
    }

    /**
     * Write the worksheet PASSWORD record.
     */
    private function _writePassword()
    {
        // Exit unless sheet protection and password have been specified
        if (! $this->_phpSheet->getProtection()->getSheet() || ! $this->_phpSheet->getProtection()->getPassword()) {
            return;
        }
        
        $record = 0x0013; // Record identifier
        $length = 0x0002; // Bytes to follow
        
        $wPassword = hexdec($this->_phpSheet->getProtection()->getPassword()); // Encoded password
        
        $header = pack("vv", $record, $length);
        $data = pack("v", $wPassword);
        
        $this->_append($header . $data);
    }

    /**
     * Insert a 24bit bitmap image in a worksheet.
     *
     * @access public
     * @param integer $row
     *            The row we are going to insert the bitmap into
     * @param integer $col
     *            The column we are going to insert the bitmap into
     * @param mixed $bitmap
     *            The bitmap filename or GD-image resource
     * @param integer $x
     *            The horizontal position (offset) of the image inside the cell.
     * @param integer $y
     *            The vertical position (offset) of the image inside the cell.
     * @param float $scale_x
     *            The horizontal scale
     * @param float $scale_y
     *            The vertical scale
     */
    function insertBitmap($row, $col, $bitmap, $x = 0, $y = 0, $scale_x = 1, $scale_y = 1)
    {
        $bitmap_array = (is_resource($bitmap) ? $this->_processBitmapGd($bitmap) : $this->_processBitmap($bitmap));
        list ($width, $height, $size, $data) = $bitmap_array; // $this->_processBitmap($bitmap);
                                                             
        // Scale the frame of the image.
        $width *= $scale_x;
        $height *= $scale_y;
        
        // Calculate the vertices of the image and write the OBJ record
        $this->_positionImage($col, $row, $x, $y, $width, $height);
        
        // Write the IMDATA record to store the bitmap data
        $record = 0x007f;
        $length = 8 + $size;
        $cf = 0x09;
        $env = 0x01;
        $lcb = $size;
        
        $header = pack("vvvvV", $record, $length, $cf, $env, $lcb);
        $this->_append($header . $data);
    }

    /**
     * Calculate the vertices that define the position of the image as required by
     * the OBJ record.
     *
     * +------------+------------+
     * | A | B |
     * +-----+------------+------------+
     * | |(x1,y1) | |
     * | 1 |(A1)._______|______ |
     * | | | | |
     * | | | | |
     * +-----+----| BITMAP |-----+
     * | | | | |
     * | 2 | |______________. |
     * | | | (B2)|
     * | | | (x2,y2)|
     * +---- +------------+------------+
     *
     * Example of a bitmap that covers some of the area from cell A1 to cell B2.
     *
     * Based on the width and height of the bitmap we need to calculate 8 vars:
     * $col_start, $row_start, $col_end, $row_end, $x1, $y1, $x2, $y2.
     * The width and height of the cells are also variable and have to be taken into
     * account.
     * The values of $col_start and $row_start are passed in from the calling
     * function. The values of $col_end and $row_end are calculated by subtracting
     * the width and height of the bitmap from the width and height of the
     * underlying cells.
     * The vertices are expressed as a percentage of the underlying cell width as
     * follows (rhs values are in pixels):
     *
     * x1 = X / W *1024
     * y1 = Y / H *256
     * x2 = (X-1) / W *1024
     * y2 = (Y-1) / H *256
     *
     * Where: X is distance from the left side of the underlying cell
     * Y is distance from the top of the underlying cell
     * W is the width of the cell
     * H is the height of the cell
     * The SDK incorrectly states that the height should be expressed as a
     * percentage of 1024.
     *
     * @access private
     * @param integer $col_start
     *            Col containing upper left corner of object
     * @param integer $row_start
     *            Row containing top left corner of object
     * @param integer $x1
     *            Distance to left side of object
     * @param integer $y1
     *            Distance to top of object
     * @param integer $width
     *            Width of image frame
     * @param integer $height
     *            Height of image frame
     */
    function _positionImage($col_start, $row_start, $x1, $y1, $width, $height)
    {
        // Initialise end cell to the same as the start cell
        $col_end = $col_start; // Col containing lower right corner of object
        $row_end = $row_start; // Row containing bottom right corner of object
                               
        // Zero the specified offset if greater than the cell dimensions
        if ($x1 >= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start))) {
            $x1 = 0;
        }
        if ($y1 >= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1)) {
            $y1 = 0;
        }
        
        $width = $width + $x1 - 1;
        $height = $height + $y1 - 1;
        
        // Subtract the underlying cell widths to find the end cell of the image
        while ($width >= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end))) {
            $width -= PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end));
            ++ $col_end;
        }
        
        // Subtract the underlying cell heights to find the end cell of the image
        while ($height >= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1)) {
            $height -= PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1);
            ++ $row_end;
        }
        
        // Bitmap isn't allowed to start or finish in a hidden cell, i.e. a cell
        // with zero eight or width.
        //
        if (PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start)) == 0) {
            return;
        }
        if (PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end)) == 0) {
            return;
        }
        if (PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1) == 0) {
            return;
        }
        if (PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1) == 0) {
            return;
        }
        
        // Convert the pixel values to the percentage value expected by Excel
        $x1 = $x1 / PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_start)) * 1024;
        $y1 = $y1 / PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_start + 1) * 256;
        $x2 = $width / PHPExcel_Shared_Excel5::sizeCol($this->_phpSheet, PHPExcel_Cell::stringFromColumnIndex($col_end)) * 1024; // Distance to right side of object
        $y2 = $height / PHPExcel_Shared_Excel5::sizeRow($this->_phpSheet, $row_end + 1) * 256; // Distance to bottom of object
        
        $this->_writeObjPicture($col_start, $x1, $row_start, $y1, $col_end, $x2, $row_end, $y2);
    }

    /**
     * Store the OBJ record that precedes an IMDATA record.
     * This could be generalise
     * to support other Excel objects.
     *
     * @param integer $colL
     *            Column containing upper left corner of object
     * @param integer $dxL
     *            Distance from left side of cell
     * @param integer $rwT
     *            Row containing top left corner of object
     * @param integer $dyT
     *            Distance from top of cell
     * @param integer $colR
     *            Column containing lower right corner of object
     * @param integer $dxR
     *            Distance from right of cell
     * @param integer $rwB
     *            Row containing bottom right corner of object
     * @param integer $dyB
     *            Distance from bottom of cell
     */
    private function _writeObjPicture($colL, $dxL, $rwT, $dyT, $colR, $dxR, $rwB, $dyB)
    {
        $record = 0x005d; // Record identifier
        $length = 0x003c; // Bytes to follow
        
        $cObj = 0x0001; // Count of objects in file (set to 1)
        $OT = 0x0008; // Object type. 8 = Picture
        $id = 0x0001; // Object ID
        $grbit = 0x0614; // Option flags
        
        $cbMacro = 0x0000; // Length of FMLA structure
        $Reserved1 = 0x0000; // Reserved
        $Reserved2 = 0x0000; // Reserved
        
        $icvBack = 0x09; // Background colour
        $icvFore = 0x09; // Foreground colour
        $fls = 0x00; // Fill pattern
        $fAuto = 0x00; // Automatic fill
        $icv = 0x08; // Line colour
        $lns = 0xff; // Line style
        $lnw = 0x01; // Line weight
        $fAutoB = 0x00; // Automatic border
        $frs = 0x0000; // Frame style
        $cf = 0x0009; // Image format, 9 = bitmap
        $Reserved3 = 0x0000; // Reserved
        $cbPictFmla = 0x0000; // Length of FMLA structure
        $Reserved4 = 0x0000; // Reserved
        $grbit2 = 0x0001; // Option flags
        $Reserved5 = 0x0000; // Reserved
        
        $header = pack("vv", $record, $length);
        $data = pack("V", $cObj);
        $data .= pack("v", $OT);
        $data .= pack("v", $id);
        $data .= pack("v", $grbit);
        $data .= pack("v", $colL);
        $data .= pack("v", $dxL);
        $data .= pack("v", $rwT);
        $data .= pack("v", $dyT);
        $data .= pack("v", $colR);
        $data .= pack("v", $dxR);
        $data .= pack("v", $rwB);
        $data .= pack("v", $dyB);
        $data .= pack("v", $cbMacro);
        $data .= pack("V", $Reserved1);
        $data .= pack("v", $Reserved2);
        $data .= pack("C", $icvBack);
        $data .= pack("C", $icvFore);
        $data .= pack("C", $fls);
        $data .= pack("C", $fAuto);
        $data .= pack("C", $icv);
        $data .= pack("C", $lns);
        $data .= pack("C", $lnw);
        $data .= pack("C", $fAutoB);
        $data .= pack("v", $frs);
        $data .= pack("V", $cf);
        $data .= pack("v", $Reserved3);
        $data .= pack("v", $cbPictFmla);
        $data .= pack("v", $Reserved4);
        $data .= pack("v", $grbit2);
        $data .= pack("V", $Reserved5);
        
        $this->_append($header . $data);
    }

    /**
     * Convert a GD-image into the internal format.
     *
     * @access private
     * @param resource $image
     *            The image to process
     * @return array Array with data and properties of the bitmap
     */
    function _processBitmapGd($image)
    {
        $width = imagesx($image);
        $height = imagesy($image);
        
        $data = pack("Vvvvv", 0x000c, $width, $height, 0x01, 0x18);
        for ($j = $height; $j --;) {
            for ($i = 0; $i < $width; ++ $i) {
                $color = imagecolorsforindex($image, imagecolorat($image, $i, $j));
                foreach (array(
                    "red",
                    "green",
                    "blue"
                ) as $key) {
                    $color[$key] = $color[$key] + round((255 - $color[$key]) * $color["alpha"] / 127);
                }
                $data .= chr($color["blue"]) . chr($color["green"]) . chr($color["red"]);
            }
            if (3 * $width % 4) {
                $data .= str_repeat("\x00", 4 - 3 * $width % 4);
            }
        }
        
        return array(
            $width,
            $height,
            strlen($data),
            $data
        );
    }

    /**
     * Convert a 24 bit bitmap into the modified internal format used by Windows.
     * This is described in BITMAPCOREHEADER and BITMAPCOREINFO structures in the
     * MSDN library.
     *
     * @access private
     * @param string $bitmap
     *            The bitmap to process
     * @return array Array with data and properties of the bitmap
     */
    function _processBitmap($bitmap)
    {
        // Open file.
        $bmp_fd = @fopen($bitmap, "rb");
        if (! $bmp_fd) {
            throw new PHPExcel_Writer_Exception("Couldn't import $bitmap");
        }
        
        // Slurp the file into a string.
        $data = fread($bmp_fd, filesize($bitmap));
        
        // Check that the file is big enough to be a bitmap.
        if (strlen($data) <= 0x36) {
            throw new PHPExcel_Writer_Exception("$bitmap doesn't contain enough data.\n");
        }
        
        // The first 2 bytes are used to identify the bitmap.
        $identity = unpack("A2ident", $data);
        if ($identity['ident'] != "BM") {
            throw new PHPExcel_Writer_Exception("$bitmap doesn't appear to be a valid bitmap image.\n");
        }
        
        // Remove bitmap data: ID.
        $data = substr($data, 2);
        
        // Read and remove the bitmap size. This is more reliable than reading
        // the data size at offset 0x22.
        //
        $size_array = unpack("Vsa", substr($data, 0, 4));
        $size = $size_array['sa'];
        $data = substr($data, 4);
        $size -= 0x36; // Subtract size of bitmap header.
        $size += 0x0C; // Add size of BIFF header.
                        
        // Remove bitmap data: reserved, offset, header length.
        $data = substr($data, 12);
        
        // Read and remove the bitmap width and height. Verify the sizes.
        $width_and_height = unpack("V2", substr($data, 0, 8));
        $width = $width_and_height[1];
        $height = $width_and_height[2];
        $data = substr($data, 8);
        if ($width > 0xFFFF) {
            throw new PHPExcel_Writer_Exception("$bitmap: largest image width supported is 65k.\n");
        }
        if ($height > 0xFFFF) {
            throw new PHPExcel_Writer_Exception("$bitmap: largest image height supported is 65k.\n");
        }
        
        // Read and remove the bitmap planes and bpp data. Verify them.
        $planes_and_bitcount = unpack("v2", substr($data, 0, 4));
        $data = substr($data, 4);
        if ($planes_and_bitcount[2] != 24) { // Bitcount
            throw new PHPExcel_Writer_Exception("$bitmap isn't a 24bit true color bitmap.\n");
        }
        if ($planes_and_bitcount[1] != 1) {
            throw new PHPExcel_Writer_Exception("$bitmap: only 1 plane supported in bitmap image.\n");
        }
        
        // Read and remove the bitmap compression. Verify compression.
        $compression = unpack("Vcomp", substr($data, 0, 4));
        $data = substr($data, 4);
        
        // $compression = 0;
        if ($compression['comp'] != 0) {
            throw new PHPExcel_Writer_Exception("$bitmap: compression not supported in bitmap image.\n");
        }
        
        // Remove bitmap data: data size, hres, vres, colours, imp. colours.
        $data = substr($data, 20);
        
        // Add the BITMAPCOREHEADER data
        $header = pack("Vvvvv", 0x000c, $width, $height, 0x01, 0x18);
        $data = $header . $data;
        
        return (array(
            $width,
            $height,
            $size,
            $data
        ));
    }

    /**
     * Store the window zoom factor.
     * This should be a reduced fraction but for
     * simplicity we will store all fractions with a numerator of 100.
     */
    private function _writeZoom()
    {
        // If scale is 100 we don't need to write a record
        if ($this->_phpSheet->getSheetView()->getZoomScale() == 100) {
            return;
        }
        
        $record = 0x00A0; // Record identifier
        $length = 0x0004; // Bytes to follow
        
        $header = pack("vv", $record, $length);
        $data = pack("vv", $this->_phpSheet->getSheetView()->getZoomScale(), 100);
        $this->_append($header . $data);
    }

    /**
     * Get Escher object
     *
     * @return PHPExcel_Shared_Escher
     */
    public function getEscher()
    {
        return $this->_escher;
    }

    /**
     * Set Escher object
     *
     * @param PHPExcel_Shared_Escher $pValue            
     */
    public function setEscher(PHPExcel_Shared_Escher $pValue = null)
    {
        $this->_escher = $pValue;
    }

    /**
     * Write MSODRAWING record
     */
    private function _writeMsoDrawing()
    {
        // write the Escher stream if necessary
        if (isset($this->_escher)) {
            $writer = new PHPExcel_Writer_Excel5_Escher($this->_escher);
            $data = $writer->close();
            $spOffsets = $writer->getSpOffsets();
            $spTypes = $writer->getSpTypes();
            // write the neccesary MSODRAWING, OBJ records
            
            // split the Escher stream
            $spOffsets[0] = 0;
            $nm = count($spOffsets) - 1; // number of shapes excluding first shape
            for ($i = 1; $i <= $nm; ++ $i) {
                // MSODRAWING record
                $record = 0x00EC; // Record identifier
                                  
                // chunk of Escher stream for one shape
                $dataChunk = substr($data, $spOffsets[$i - 1], $spOffsets[$i] - $spOffsets[$i - 1]);
                
                $length = strlen($dataChunk);
                $header = pack("vv", $record, $length);
                
                $this->_append($header . $dataChunk);
                
                // OBJ record
                $record = 0x005D; // record identifier
                $objData = '';
                
                // ftCmo
                if ($spTypes[$i] == 0x00C9) {
                    // Add ftCmo (common object data) subobject
                    $objData .= pack('vvvvvVVV', 0x0015, // 0x0015 = ftCmo
0x0012, // length of ftCmo data
0x0014, // object type, 0x0014 = filter
$i, // object id number, Excel seems to use 1-based index, local for the sheet
0x2101, // option flags, 0x2001 is what OpenOffice.org uses
0, // reserved
0, // reserved
0) // reserved
;
                    
                    // Add ftSbs Scroll bar subobject
                    $objData .= pack('vv', 0x00C, 0x0014);
                    $objData .= pack('H*', '0000000000000000640001000A00000010000100');
                    // Add ftLbsData (List box data) subobject
                    $objData .= pack('vv', 0x0013, 0x1FEE);
                    $objData .= pack('H*', '00000000010001030000020008005700');
                } else {
                    // Add ftCmo (common object data) subobject
                    $objData .= pack('vvvvvVVV', 0x0015, // 0x0015 = ftCmo
0x0012, // length of ftCmo data
0x0008, // object type, 0x0008 = picture
$i, // object id number, Excel seems to use 1-based index, local for the sheet
0x6011, // option flags, 0x6011 is what OpenOffice.org uses
0, // reserved
0, // reserved
0) // reserved
;
                }
                
                // ftEnd
                $objData .= pack('vv', 0x0000, // 0x0000 = ftEnd
0x0000) // length of ftEnd data
;
                
                $length = strlen($objData);
                $header = pack('vv', $record, $length);
                $this->_append($header . $objData);
            }
        }
    }

    /**
     * Store the DATAVALIDATIONS and DATAVALIDATION records.
     */
    private function _writeDataValidity()
    {
        // Datavalidation collection
        $dataValidationCollection = $this->_phpSheet->getDataValidationCollection();
        
        // Write data validations?
        if (! empty($dataValidationCollection)) {
            
            // DATAVALIDATIONS record
            $record = 0x01B2; // Record identifier
            $length = 0x0012; // Bytes to follow
            
            $grbit = 0x0000; // Prompt box at cell, no cached validity data at DV records
            $horPos = 0x00000000; // Horizontal position of prompt box, if fixed position
            $verPos = 0x00000000; // Vertical position of prompt box, if fixed position
            $objId = 0xFFFFFFFF; // Object identifier of drop down arrow object, or -1 if not visible
            
            $header = pack('vv', $record, $length);
            $data = pack('vVVVV', $grbit, $horPos, $verPos, $objId, count($dataValidationCollection));
            $this->_append($header . $data);
            
            // DATAVALIDATION records
            $record = 0x01BE; // Record identifier
            
            foreach ($dataValidationCollection as $cellCoordinate => $dataValidation) {
                // initialize record data
                $data = '';
                
                // options
                $options = 0x00000000;
                
                // data type
                $type = $dataValidation->getType();
                switch ($type) {
                    case PHPExcel_Cell_DataValidation::TYPE_NONE:
                        $type = 0x00;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_WHOLE:
                        $type = 0x01;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_DECIMAL:
                        $type = 0x02;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_LIST:
                        $type = 0x03;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_DATE:
                        $type = 0x04;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_TIME:
                        $type = 0x05;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_TEXTLENGTH:
                        $type = 0x06;
                        break;
                    case PHPExcel_Cell_DataValidation::TYPE_CUSTOM:
                        $type = 0x07;
                        break;
                }
                $options |= $type << 0;
                
                // error style
                $errorStyle = $dataValidation->getType();
                switch ($errorStyle) {
                    case PHPExcel_Cell_DataValidation::STYLE_STOP:
                        $errorStyle = 0x00;
                        break;
                    case PHPExcel_Cell_DataValidation::STYLE_WARNING:
                        $errorStyle = 0x01;
                        break;
                    case PHPExcel_Cell_DataValidation::STYLE_INFORMATION:
                        $errorStyle = 0x02;
                        break;
                }
                $options |= $errorStyle << 4;
                
                // explicit formula?
                if ($type == 0x03 && preg_match('/^\".*\"$/', $dataValidation->getFormula1())) {
                    $options |= 0x01 << 7;
                }
                
                // empty cells allowed
                $options |= $dataValidation->getAllowBlank() << 8;
                
                // show drop down
                $options |= (! $dataValidation->getShowDropDown()) << 9;
                
                // show input message
                $options |= $dataValidation->getShowInputMessage() << 18;
                
                // show error message
                $options |= $dataValidation->getShowErrorMessage() << 19;
                
                // condition operator
                $operator = $dataValidation->getOperator();
                switch ($operator) {
                    case PHPExcel_Cell_DataValidation::OPERATOR_BETWEEN:
                        $operator = 0x00;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_NOTBETWEEN:
                        $operator = 0x01;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_EQUAL:
                        $operator = 0x02;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_NOTEQUAL:
                        $operator = 0x03;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_GREATERTHAN:
                        $operator = 0x04;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_LESSTHAN:
                        $operator = 0x05;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_GREATERTHANOREQUAL:
                        $operator = 0x06;
                        break;
                    case PHPExcel_Cell_DataValidation::OPERATOR_LESSTHANOREQUAL:
                        $operator = 0x07;
                        break;
                }
                $options |= $operator << 20;
                
                $data = pack('V', $options);
                
                // prompt title
                $promptTitle = $dataValidation->getPromptTitle() !== '' ? $dataValidation->getPromptTitle() : chr(0);
                $data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($promptTitle);
                
                // error title
                $errorTitle = $dataValidation->getErrorTitle() !== '' ? $dataValidation->getErrorTitle() : chr(0);
                $data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($errorTitle);
                
                // prompt text
                $prompt = $dataValidation->getPrompt() !== '' ? $dataValidation->getPrompt() : chr(0);
                $data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($prompt);
                
                // error text
                $error = $dataValidation->getError() !== '' ? $dataValidation->getError() : chr(0);
                $data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($error);
                
                // formula 1
                try {
                    $formula1 = $dataValidation->getFormula1();
                    if ($type == 0x03) { // list type
                        $formula1 = str_replace(',', chr(0), $formula1);
                    }
                    $this->_parser->parse($formula1);
                    $formula1 = $this->_parser->toReversePolish();
                    $sz1 = strlen($formula1);
                } catch (PHPExcel_Exception $e) {
                    $sz1 = 0;
                    $formula1 = '';
                }
                $data .= pack('vv', $sz1, 0x0000);
                $data .= $formula1;
                
                // formula 2
                try {
                    $formula2 = $dataValidation->getFormula2();
                    if ($formula2 === '') {
                        throw new PHPExcel_Writer_Exception('No formula2');
                    }
                    $this->_parser->parse($formula2);
                    $formula2 = $this->_parser->toReversePolish();
                    $sz2 = strlen($formula2);
                } catch (PHPExcel_Exception $e) {
                    $sz2 = 0;
                    $formula2 = '';
                }
                $data .= pack('vv', $sz2, 0x0000);
                $data .= $formula2;
                
                // cell range address list
                $data .= pack('v', 0x0001);
                $data .= $this->_writeBIFF8CellRangeAddressFixed($cellCoordinate);
                
                $length = strlen($data);
                $header = pack("vv", $record, $length);
                
                $this->_append($header . $data);
            }
        }
    }

    /**
     * Map Error code
     *
     * @param string $errorCode            
     * @return int
     */
    private static function _mapErrorCode($errorCode)
    {
        switch ($errorCode) {
            case '#NULL!':
                return 0x00;
            case '#DIV/0!':
                return 0x07;
            case '#VALUE!':
                return 0x0F;
            case '#REF!':
                return 0x17;
            case '#NAME?':
                return 0x1D;
            case '#NUM!':
                return 0x24;
            case '#N/A':
                return 0x2A;
        }
        
        return 0;
    }

    /**
     * Write PLV Record
     */
    private function _writePageLayoutView()
    {
        $record = 0x088B; // Record identifier
        $length = 0x0010; // Bytes to follow
        
        $rt = 0x088B; // 2
        $grbitFrt = 0x0000; // 2
        $reserved = 0x0000000000000000; // 8
        $wScalvePLV = $this->_phpSheet->getSheetView()->getZoomScale(); // 2
                                                                        
        // The options flags that comprise $grbit
        if ($this->_phpSheet->getSheetView()->getView() == PHPExcel_Worksheet_SheetView::SHEETVIEW_PAGE_LAYOUT) {
            $fPageLayoutView = 1;
        } else {
            $fPageLayoutView = 0;
        }
        $fRulerVisible = 0;
        $fWhitespaceHidden = 0;
        
        $grbit = $fPageLayoutView; // 2
        $grbit |= $fRulerVisible << 1;
        $grbit |= $fWhitespaceHidden << 3;
        
        $header = pack("vv", $record, $length);
        $data = pack("vvVVvv", $rt, $grbitFrt, 0x00000000, 0x00000000, $wScalvePLV, $grbit);
        $this->_append($header . $data);
    }

    /**
     * Write CFRule Record
     * 
     * @param PHPExcel_Style_Conditional $conditional            
     */
    private function _writeCFRule(PHPExcel_Style_Conditional $conditional)
    {
        $record = 0x01B1; // Record identifier
                            
        // $type : Type of the CF
                            // $operatorType : Comparison operator
        if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_EXPRESSION) {
            $type = 0x02;
            $operatorType = 0x00;
        } else 
            if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CELLIS) {
                $type = 0x01;
                
                switch ($conditional->getOperatorType()) {
                    case PHPExcel_Style_Conditional::OPERATOR_NONE:
                        $operatorType = 0x00;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_EQUAL:
                        $operatorType = 0x03;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_GREATERTHAN:
                        $operatorType = 0x05;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_GREATERTHANOREQUAL:
                        $operatorType = 0x07;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_LESSTHAN:
                        $operatorType = 0x06;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_LESSTHANOREQUAL:
                        $operatorType = 0x08;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_NOTEQUAL:
                        $operatorType = 0x04;
                        break;
                    case PHPExcel_Style_Conditional::OPERATOR_BETWEEN:
                        $operatorType = 0x01;
                        break;
                    // not OPERATOR_NOTBETWEEN 0x02
                }
            }
        
        // $szValue1 : size of the formula data for first value or formula
        // $szValue2 : size of the formula data for second value or formula
        $arrConditions = $conditional->getConditions();
        $numConditions = sizeof($arrConditions);
        if ($numConditions == 1) {
            $szValue1 = ($arrConditions[0] <= 65535 ? 3 : 0x0000);
            $szValue2 = 0x0000;
            $operand1 = pack('Cv', 0x1E, $arrConditions[0]);
            $operand2 = null;
        } else 
            if ($numConditions == 2 && ($conditional->getOperatorType() == PHPExcel_Style_Conditional::OPERATOR_BETWEEN)) {
                $szValue1 = ($arrConditions[0] <= 65535 ? 3 : 0x0000);
                $szValue2 = ($arrConditions[1] <= 65535 ? 3 : 0x0000);
                $operand1 = pack('Cv', 0x1E, $arrConditions[0]);
                $operand2 = pack('Cv', 0x1E, $arrConditions[1]);
            } else {
                $szValue1 = 0x0000;
                $szValue2 = 0x0000;
                $operand1 = null;
                $operand2 = null;
            }
        
        // $flags : Option flags
        // Alignment
        $bAlignHz = ($conditional->getStyle()
            ->getAlignment()
            ->getHorizontal() == null ? 1 : 0);
        $bAlignVt = ($conditional->getStyle()
            ->getAlignment()
            ->getVertical() == null ? 1 : 0);
        $bAlignWrapTx = ($conditional->getStyle()
            ->getAlignment()
            ->getWrapText() == false ? 1 : 0);
        $bTxRotation = ($conditional->getStyle()
            ->getAlignment()
            ->getTextRotation() == null ? 1 : 0);
        $bIndent = ($conditional->getStyle()
            ->getAlignment()
            ->getIndent() == 0 ? 1 : 0);
        $bShrinkToFit = ($conditional->getStyle()
            ->getAlignment()
            ->getShrinkToFit() == false ? 1 : 0);
        if ($bAlignHz == 0 || $bAlignVt == 0 || $bAlignWrapTx == 0 || $bTxRotation == 0 || $bIndent == 0 || $bShrinkToFit == 0) {
            $bFormatAlign = 1;
        } else {
            $bFormatAlign = 0;
        }
        // Protection
        $bProtLocked = ($conditional->getStyle()
            ->getProtection()
            ->getLocked() == null ? 1 : 0);
        $bProtHidden = ($conditional->getStyle()
            ->getProtection()
            ->getHidden() == null ? 1 : 0);
        if ($bProtLocked == 0 || $bProtHidden == 0) {
            $bFormatProt = 1;
        } else {
            $bFormatProt = 0;
        }
        // Border
        $bBorderLeft = ($conditional->getStyle()
            ->getBorders()
            ->getLeft()
            ->getColor()
            ->getARGB() == PHPExcel_Style_Color::COLOR_BLACK && $conditional->getStyle()
            ->getBorders()
            ->getLeft()
            ->getBorderStyle() == PHPExcel_Style_Border::BORDER_NONE ? 1 : 0);
        $bBorderRight = ($conditional->getStyle()
            ->getBorders()
            ->getRight()
            ->getColor()
            ->getARGB() == PHPExcel_Style_Color::COLOR_BLACK && $conditional->getStyle()
            ->getBorders()
            ->getRight()
            ->getBorderStyle() == PHPExcel_Style_Border::BORDER_NONE ? 1 : 0);
        $bBorderTop = ($conditional->getStyle()
            ->getBorders()
            ->getTop()
            ->getColor()
            ->getARGB() == PHPExcel_Style_Color::COLOR_BLACK && $conditional->getStyle()
            ->getBorders()
            ->getTop()
            ->getBorderStyle() == PHPExcel_Style_Border::BORDER_NONE ? 1 : 0);
        $bBorderBottom = ($conditional->getStyle()
            ->getBorders()
            ->getBottom()
            ->getColor()
            ->getARGB() == PHPExcel_Style_Color::COLOR_BLACK && $conditional->getStyle()
            ->getBorders()
            ->getBottom()
            ->getBorderStyle() == PHPExcel_Style_Border::BORDER_NONE ? 1 : 0);
        if ($bBorderLeft == 0 || $bBorderRight == 0 || $bBorderTop == 0 || $bBorderBottom == 0) {
            $bFormatBorder = 1;
        } else {
            $bFormatBorder = 0;
        }
        // Pattern
        $bFillStyle = ($conditional->getStyle()
            ->getFill()
            ->getFillType() == null ? 0 : 1);
        $bFillColor = ($conditional->getStyle()
            ->getFill()
            ->getStartColor()
            ->getARGB() == null ? 0 : 1);
        $bFillColorBg = ($conditional->getStyle()
            ->getFill()
            ->getEndColor()
            ->getARGB() == null ? 0 : 1);
        if ($bFillStyle == 0 || $bFillColor == 0 || $bFillColorBg == 0) {
            $bFormatFill = 1;
        } else {
            $bFormatFill = 0;
        }
        // Font
        if ($conditional->getStyle()
            ->getFont()
            ->getName() != null || $conditional->getStyle()
            ->getFont()
            ->getSize() != null || $conditional->getStyle()
            ->getFont()
            ->getBold() != null || $conditional->getStyle()
            ->getFont()
            ->getItalic() != null || $conditional->getStyle()
            ->getFont()
            ->getSuperScript() != null || $conditional->getStyle()
            ->getFont()
            ->getSubScript() != null || $conditional->getStyle()
            ->getFont()
            ->getUnderline() != null || $conditional->getStyle()
            ->getFont()
            ->getStrikethrough() != null || $conditional->getStyle()
            ->getFont()
            ->getColor()
            ->getARGB() != null) {
            $bFormatFont = 1;
        } else {
            $bFormatFont = 0;
        }
        // Alignment
        $flags = 0;
        $flags |= (1 == $bAlignHz ? 0x00000001 : 0);
        $flags |= (1 == $bAlignVt ? 0x00000002 : 0);
        $flags |= (1 == $bAlignWrapTx ? 0x00000004 : 0);
        $flags |= (1 == $bTxRotation ? 0x00000008 : 0);
        // Justify last line flag
        $flags |= (1 == 1 ? 0x00000010 : 0);
        $flags |= (1 == $bIndent ? 0x00000020 : 0);
        $flags |= (1 == $bShrinkToFit ? 0x00000040 : 0);
        // Default
        $flags |= (1 == 1 ? 0x00000080 : 0);
        // Protection
        $flags |= (1 == $bProtLocked ? 0x00000100 : 0);
        $flags |= (1 == $bProtHidden ? 0x00000200 : 0);
        // Border
        $flags |= (1 == $bBorderLeft ? 0x00000400 : 0);
        $flags |= (1 == $bBorderRight ? 0x00000800 : 0);
        $flags |= (1 == $bBorderTop ? 0x00001000 : 0);
        $flags |= (1 == $bBorderBottom ? 0x00002000 : 0);
        $flags |= (1 == 1 ? 0x00004000 : 0); // Top left to Bottom right border
        $flags |= (1 == 1 ? 0x00008000 : 0); // Bottom left to Top right border
                                                          // Pattern
        $flags |= (1 == $bFillStyle ? 0x00010000 : 0);
        $flags |= (1 == $bFillColor ? 0x00020000 : 0);
        $flags |= (1 == $bFillColorBg ? 0x00040000 : 0);
        $flags |= (1 == 1 ? 0x00380000 : 0);
        // Font
        $flags |= (1 == $bFormatFont ? 0x04000000 : 0);
        // Alignment :
        $flags |= (1 == $bFormatAlign ? 0x08000000 : 0);
        // Border
        $flags |= (1 == $bFormatBorder ? 0x10000000 : 0);
        // Pattern
        $flags |= (1 == $bFormatFill ? 0x20000000 : 0);
        // Protection
        $flags |= (1 == $bFormatProt ? 0x40000000 : 0);
        // Text direction
        $flags |= (1 == 0 ? 0x80000000 : 0);
        
        // Data Blocks
        if ($bFormatFont == 1) {
            // Font Name
            if ($conditional->getStyle()
                ->getFont()
                ->getName() == null) {
                $dataBlockFont = pack('VVVVVVVV', 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000);
                $dataBlockFont .= pack('VVVVVVVV', 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000);
            } else {
                $dataBlockFont = PHPExcel_Shared_String::UTF8toBIFF8UnicodeLong($conditional->getStyle()
                    ->getFont()
                    ->getName());
            }
            // Font Size
            if ($conditional->getStyle()
                ->getFont()
                ->getSize() == null) {
                $dataBlockFont .= pack('V', 20 * 11);
            } else {
                $dataBlockFont .= pack('V', 20 * $conditional->getStyle()
                    ->getFont()
                    ->getSize());
            }
            // Font Options
            $dataBlockFont .= pack('V', 0);
            // Font weight
            if ($conditional->getStyle()
                ->getFont()
                ->getBold() == true) {
                $dataBlockFont .= pack('v', 0x02BC);
            } else {
                $dataBlockFont .= pack('v', 0x0190);
            }
            // Escapement type
            if ($conditional->getStyle()
                ->getFont()
                ->getSubScript() == true) {
                $dataBlockFont .= pack('v', 0x02);
                $fontEscapement = 0;
            } else 
                if ($conditional->getStyle()
                    ->getFont()
                    ->getSuperScript() == true) {
                    $dataBlockFont .= pack('v', 0x01);
                    $fontEscapement = 0;
                } else {
                    $dataBlockFont .= pack('v', 0x00);
                    $fontEscapement = 1;
                }
            // Underline type
            switch ($conditional->getStyle()
                ->getFont()
                ->getUnderline()) {
                case PHPExcel_Style_Font::UNDERLINE_NONE:
                    $dataBlockFont .= pack('C', 0x00);
                    $fontUnderline = 0;
                    break;
                case PHPExcel_Style_Font::UNDERLINE_DOUBLE:
                    $dataBlockFont .= pack('C', 0x02);
                    $fontUnderline = 0;
                    break;
                case PHPExcel_Style_Font::UNDERLINE_DOUBLEACCOUNTING:
                    $dataBlockFont .= pack('C', 0x22);
                    $fontUnderline = 0;
                    break;
                case PHPExcel_Style_Font::UNDERLINE_SINGLE:
                    $dataBlockFont .= pack('C', 0x01);
                    $fontUnderline = 0;
                    break;
                case PHPExcel_Style_Font::UNDERLINE_SINGLEACCOUNTING:
                    $dataBlockFont .= pack('C', 0x21);
                    $fontUnderline = 0;
                    break;
                default:
                    $dataBlockFont .= pack('C', 0x00);
                    $fontUnderline = 1;
                    break;
            }
            // Not used (3)
            $dataBlockFont .= pack('vC', 0x0000, 0x00);
            // Font color index
            switch ($conditional->getStyle()
                ->getFont()
                ->getColor()
                ->getRGB()) {
                case '000000':
                    $colorIdx = 0x08;
                    break;
                case 'FFFFFF':
                    $colorIdx = 0x09;
                    break;
                case 'FF0000':
                    $colorIdx = 0x0A;
                    break;
                case '00FF00':
                    $colorIdx = 0x0B;
                    break;
                case '0000FF':
                    $colorIdx = 0x0C;
                    break;
                case 'FFFF00':
                    $colorIdx = 0x0D;
                    break;
                case 'FF00FF':
                    $colorIdx = 0x0E;
                    break;
                case '00FFFF':
                    $colorIdx = 0x0F;
                    break;
                case '800000':
                    $colorIdx = 0x10;
                    break;
                case '008000':
                    $colorIdx = 0x11;
                    break;
                case '000080':
                    $colorIdx = 0x12;
                    break;
                case '808000':
                    $colorIdx = 0x13;
                    break;
                case '800080':
                    $colorIdx = 0x14;
                    break;
                case '008080':
                    $colorIdx = 0x15;
                    break;
                case 'C0C0C0':
                    $colorIdx = 0x16;
                    break;
                case '808080':
                    $colorIdx = 0x17;
                    break;
                case '9999FF':
                    $colorIdx = 0x18;
                    break;
                case '993366':
                    $colorIdx = 0x19;
                    break;
                case 'FFFFCC':
                    $colorIdx = 0x1A;
                    break;
                case 'CCFFFF':
                    $colorIdx = 0x1B;
                    break;
                case '660066':
                    $colorIdx = 0x1C;
                    break;
                case 'FF8080':
                    $colorIdx = 0x1D;
                    break;
                case '0066CC':
                    $colorIdx = 0x1E;
                    break;
                case 'CCCCFF':
                    $colorIdx = 0x1F;
                    break;
                case '000080':
                    $colorIdx = 0x20;
                    break;
                case 'FF00FF':
                    $colorIdx = 0x21;
                    break;
                case 'FFFF00':
                    $colorIdx = 0x22;
                    break;
                case '00FFFF':
                    $colorIdx = 0x23;
                    break;
                case '800080':
                    $colorIdx = 0x24;
                    break;
                case '800000':
                    $colorIdx = 0x25;
                    break;
                case '008080':
                    $colorIdx = 0x26;
                    break;
                case '0000FF':
                    $colorIdx = 0x27;
                    break;
                case '00CCFF':
                    $colorIdx = 0x28;
                    break;
                case 'CCFFFF':
                    $colorIdx = 0x29;
                    break;
                case 'CCFFCC':
                    $colorIdx = 0x2A;
                    break;
                case 'FFFF99':
                    $colorIdx = 0x2B;
                    break;
                case '99CCFF':
                    $colorIdx = 0x2C;
                    break;
                case 'FF99CC':
                    $colorIdx = 0x2D;
                    break;
                case 'CC99FF':
                    $colorIdx = 0x2E;
                    break;
                case 'FFCC99':
                    $colorIdx = 0x2F;
                    break;
                case '3366FF':
                    $colorIdx = 0x30;
                    break;
                case '33CCCC':
                    $colorIdx = 0x31;
                    break;
                case '99CC00':
                    $colorIdx = 0x32;
                    break;
                case 'FFCC00':
                    $colorIdx = 0x33;
                    break;
                case 'FF9900':
                    $colorIdx = 0x34;
                    break;
                case 'FF6600':
                    $colorIdx = 0x35;
                    break;
                case '666699':
                    $colorIdx = 0x36;
                    break;
                case '969696':
                    $colorIdx = 0x37;
                    break;
                case '003366':
                    $colorIdx = 0x38;
                    break;
                case '339966':
                    $colorIdx = 0x39;
                    break;
                case '003300':
                    $colorIdx = 0x3A;
                    break;
                case '333300':
                    $colorIdx = 0x3B;
                    break;
                case '993300':
                    $colorIdx = 0x3C;
                    break;
                case '993366':
                    $colorIdx = 0x3D;
                    break;
                case '333399':
                    $colorIdx = 0x3E;
                    break;
                case '333333':
                    $colorIdx = 0x3F;
                    break;
                default:
                    $colorIdx = 0x00;
                    break;
            }
            $dataBlockFont .= pack('V', $colorIdx);
            // Not used (4)
            $dataBlockFont .= pack('V', 0x00000000);
            // Options flags for modified font attributes
            $optionsFlags = 0;
            $optionsFlagsBold = ($conditional->getStyle()
                ->getFont()
                ->getBold() == null ? 1 : 0);
            $optionsFlags |= (1 == $optionsFlagsBold ? 0x00000002 : 0);
            $optionsFlags |= (1 == 1 ? 0x00000008 : 0);
            $optionsFlags |= (1 == 1 ? 0x00000010 : 0);
            $optionsFlags |= (1 == 0 ? 0x00000020 : 0);
            $optionsFlags |= (1 == 1 ? 0x00000080 : 0);
            $dataBlockFont .= pack('V', $optionsFlags);
            // Escapement type
            $dataBlockFont .= pack('V', $fontEscapement);
            // Underline type
            $dataBlockFont .= pack('V', $fontUnderline);
            // Always
            $dataBlockFont .= pack('V', 0x00000000);
            // Always
            $dataBlockFont .= pack('V', 0x00000000);
            // Not used (8)
            $dataBlockFont .= pack('VV', 0x00000000, 0x00000000);
            // Always
            $dataBlockFont .= pack('v', 0x0001);
        }
        if ($bFormatAlign == 1) {
            $blockAlign = 0;
            // Alignment and text break
            switch ($conditional->getStyle()
                ->getAlignment()
                ->getHorizontal()) {
                case PHPExcel_Style_Alignment::HORIZONTAL_GENERAL:
                    $blockAlign = 0;
                    break;
                case PHPExcel_Style_Alignment::HORIZONTAL_LEFT:
                    $blockAlign = 1;
                    break;
                case PHPExcel_Style_Alignment::HORIZONTAL_RIGHT:
                    $blockAlign = 3;
                    break;
                case PHPExcel_Style_Alignment::HORIZONTAL_CENTER:
                    $blockAlign = 2;
                    break;
                case PHPExcel_Style_Alignment::HORIZONTAL_CENTER_CONTINUOUS:
                    $blockAlign = 6;
                    break;
                case PHPExcel_Style_Alignment::HORIZONTAL_JUSTIFY:
                    $blockAlign = 5;
                    break;
            }
            if ($conditional->getStyle()
                ->getAlignment()
                ->getWrapText() == true) {
                $blockAlign |= 1 << 3;
            } else {
                $blockAlign |= 0 << 3;
            }
            switch ($conditional->getStyle()
                ->getAlignment()
                ->getVertical()) {
                case PHPExcel_Style_Alignment::VERTICAL_BOTTOM:
                    $blockAlign = 2 << 4;
                    break;
                case PHPExcel_Style_Alignment::VERTICAL_TOP:
                    $blockAlign = 0 << 4;
                    break;
                case PHPExcel_Style_Alignment::VERTICAL_CENTER:
                    $blockAlign = 1 << 4;
                    break;
                case PHPExcel_Style_Alignment::VERTICAL_JUSTIFY:
                    $blockAlign = 3 << 4;
                    break;
            }
            $blockAlign |= 0 << 7;
            
            // Text rotation angle
            $blockRotation = $conditional->getStyle()
                ->getAlignment()
                ->getTextRotation();
            
            // Indentation
            $blockIndent = $conditional->getStyle()
                ->getAlignment()
                ->getIndent();
            if ($conditional->getStyle()
                ->getAlignment()
                ->getShrinkToFit() == true) {
                $blockIndent |= 1 << 4;
            } else {
                $blockIndent |= 0 << 4;
            }
            $blockIndent |= 0 << 6;
            
            // Relative indentation
            $blockIndentRelative = 255;
            
            $dataBlockAlign = pack('CCvvv', $blockAlign, $blockRotation, $blockIndent, $blockIndentRelative, 0x0000);
        }
        if ($bFormatBorder == 1) {
            $blockLineStyle = 0;
            switch ($conditional->getStyle()
                ->getBorders()
                ->getLeft()
                ->getBorderStyle()) {
                case PHPExcel_Style_Border::BORDER_NONE:
                    $blockLineStyle |= 0x00;
                    break;
                case PHPExcel_Style_Border::BORDER_THIN:
                    $blockLineStyle |= 0x01;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUM:
                    $blockLineStyle |= 0x02;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHED:
                    $blockLineStyle |= 0x03;
                    break;
                case PHPExcel_Style_Border::BORDER_DOTTED:
                    $blockLineStyle |= 0x04;
                    break;
                case PHPExcel_Style_Border::BORDER_THICK:
                    $blockLineStyle |= 0x05;
                    break;
                case PHPExcel_Style_Border::BORDER_DOUBLE:
                    $blockLineStyle |= 0x06;
                    break;
                case PHPExcel_Style_Border::BORDER_HAIR:
                    $blockLineStyle |= 0x07;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHED:
                    $blockLineStyle |= 0x08;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOT:
                    $blockLineStyle |= 0x09;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT:
                    $blockLineStyle |= 0x0A;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOTDOT:
                    $blockLineStyle |= 0x0B;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT:
                    $blockLineStyle |= 0x0C;
                    break;
                case PHPExcel_Style_Border::BORDER_SLANTDASHDOT:
                    $blockLineStyle |= 0x0D;
                    break;
            }
            switch ($conditional->getStyle()
                ->getBorders()
                ->getRight()
                ->getBorderStyle()) {
                case PHPExcel_Style_Border::BORDER_NONE:
                    $blockLineStyle |= 0x00 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_THIN:
                    $blockLineStyle |= 0x01 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUM:
                    $blockLineStyle |= 0x02 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHED:
                    $blockLineStyle |= 0x03 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_DOTTED:
                    $blockLineStyle |= 0x04 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_THICK:
                    $blockLineStyle |= 0x05 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_DOUBLE:
                    $blockLineStyle |= 0x06 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_HAIR:
                    $blockLineStyle |= 0x07 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHED:
                    $blockLineStyle |= 0x08 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOT:
                    $blockLineStyle |= 0x09 << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT:
                    $blockLineStyle |= 0x0A << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOTDOT:
                    $blockLineStyle |= 0x0B << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT:
                    $blockLineStyle |= 0x0C << 4;
                    break;
                case PHPExcel_Style_Border::BORDER_SLANTDASHDOT:
                    $blockLineStyle |= 0x0D << 4;
                    break;
            }
            switch ($conditional->getStyle()
                ->getBorders()
                ->getTop()
                ->getBorderStyle()) {
                case PHPExcel_Style_Border::BORDER_NONE:
                    $blockLineStyle |= 0x00 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_THIN:
                    $blockLineStyle |= 0x01 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUM:
                    $blockLineStyle |= 0x02 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHED:
                    $blockLineStyle |= 0x03 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_DOTTED:
                    $blockLineStyle |= 0x04 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_THICK:
                    $blockLineStyle |= 0x05 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_DOUBLE:
                    $blockLineStyle |= 0x06 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_HAIR:
                    $blockLineStyle |= 0x07 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHED:
                    $blockLineStyle |= 0x08 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOT:
                    $blockLineStyle |= 0x09 << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT:
                    $blockLineStyle |= 0x0A << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOTDOT:
                    $blockLineStyle |= 0x0B << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT:
                    $blockLineStyle |= 0x0C << 8;
                    break;
                case PHPExcel_Style_Border::BORDER_SLANTDASHDOT:
                    $blockLineStyle |= 0x0D << 8;
                    break;
            }
            switch ($conditional->getStyle()
                ->getBorders()
                ->getBottom()
                ->getBorderStyle()) {
                case PHPExcel_Style_Border::BORDER_NONE:
                    $blockLineStyle |= 0x00 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_THIN:
                    $blockLineStyle |= 0x01 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUM:
                    $blockLineStyle |= 0x02 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHED:
                    $blockLineStyle |= 0x03 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_DOTTED:
                    $blockLineStyle |= 0x04 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_THICK:
                    $blockLineStyle |= 0x05 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_DOUBLE:
                    $blockLineStyle |= 0x06 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_HAIR:
                    $blockLineStyle |= 0x07 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHED:
                    $blockLineStyle |= 0x08 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOT:
                    $blockLineStyle |= 0x09 << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT:
                    $blockLineStyle |= 0x0A << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOTDOT:
                    $blockLineStyle |= 0x0B << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT:
                    $blockLineStyle |= 0x0C << 12;
                    break;
                case PHPExcel_Style_Border::BORDER_SLANTDASHDOT:
                    $blockLineStyle |= 0x0D << 12;
                    break;
            }
            // @todo _writeCFRule() => $blockLineStyle => Index Color for left line
            // @todo _writeCFRule() => $blockLineStyle => Index Color for right line
            // @todo _writeCFRule() => $blockLineStyle => Top-left to bottom-right on/off
            // @todo _writeCFRule() => $blockLineStyle => Bottom-left to top-right on/off
            $blockColor = 0;
            // @todo _writeCFRule() => $blockColor => Index Color for top line
            // @todo _writeCFRule() => $blockColor => Index Color for bottom line
            // @todo _writeCFRule() => $blockColor => Index Color for diagonal line
            switch ($conditional->getStyle()
                ->getBorders()
                ->getDiagonal()
                ->getBorderStyle()) {
                case PHPExcel_Style_Border::BORDER_NONE:
                    $blockColor |= 0x00 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_THIN:
                    $blockColor |= 0x01 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUM:
                    $blockColor |= 0x02 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHED:
                    $blockColor |= 0x03 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_DOTTED:
                    $blockColor |= 0x04 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_THICK:
                    $blockColor |= 0x05 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_DOUBLE:
                    $blockColor |= 0x06 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_HAIR:
                    $blockColor |= 0x07 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHED:
                    $blockColor |= 0x08 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOT:
                    $blockColor |= 0x09 << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOT:
                    $blockColor |= 0x0A << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_DASHDOTDOT:
                    $blockColor |= 0x0B << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_MEDIUMDASHDOTDOT:
                    $blockColor |= 0x0C << 21;
                    break;
                case PHPExcel_Style_Border::BORDER_SLANTDASHDOT:
                    $blockColor |= 0x0D << 21;
                    break;
            }
            $dataBlockBorder = pack('vv', $blockLineStyle, $blockColor);
        }
        if ($bFormatFill == 1) {
            // Fill Patern Style
            $blockFillPatternStyle = 0;
            switch ($conditional->getStyle()
                ->getFill()
                ->getFillType()) {
                case PHPExcel_Style_Fill::FILL_NONE:
                    $blockFillPatternStyle = 0x00;
                    break;
                case PHPExcel_Style_Fill::FILL_SOLID:
                    $blockFillPatternStyle = 0x01;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_MEDIUMGRAY:
                    $blockFillPatternStyle = 0x02;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKGRAY:
                    $blockFillPatternStyle = 0x03;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTGRAY:
                    $blockFillPatternStyle = 0x04;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKHORIZONTAL:
                    $blockFillPatternStyle = 0x05;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKVERTICAL:
                    $blockFillPatternStyle = 0x06;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKDOWN:
                    $blockFillPatternStyle = 0x07;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKUP:
                    $blockFillPatternStyle = 0x08;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKGRID:
                    $blockFillPatternStyle = 0x09;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_DARKTRELLIS:
                    $blockFillPatternStyle = 0x0A;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTHORIZONTAL:
                    $blockFillPatternStyle = 0x0B;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTVERTICAL:
                    $blockFillPatternStyle = 0x0C;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTDOWN:
                    $blockFillPatternStyle = 0x0D;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTUP:
                    $blockFillPatternStyle = 0x0E;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTGRID:
                    $blockFillPatternStyle = 0x0F;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_LIGHTTRELLIS:
                    $blockFillPatternStyle = 0x10;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_GRAY125:
                    $blockFillPatternStyle = 0x11;
                    break;
                case PHPExcel_Style_Fill::FILL_PATTERN_GRAY0625:
                    $blockFillPatternStyle = 0x12;
                    break;
                case PHPExcel_Style_Fill::FILL_GRADIENT_LINEAR:
                    $blockFillPatternStyle = 0x00;
                    break; // does not exist in BIFF8
                case PHPExcel_Style_Fill::FILL_GRADIENT_PATH:
                    $blockFillPatternStyle = 0x00;
                    break; // does not exist in BIFF8
                default:
                    $blockFillPatternStyle = 0x00;
                    break;
            }
            // Color
            switch ($conditional->getStyle()
                ->getFill()
                ->getStartColor()
                ->getRGB()) {
                case '000000':
                    $colorIdxBg = 0x08;
                    break;
                case 'FFFFFF':
                    $colorIdxBg = 0x09;
                    break;
                case 'FF0000':
                    $colorIdxBg = 0x0A;
                    break;
                case '00FF00':
                    $colorIdxBg = 0x0B;
                    break;
                case '0000FF':
                    $colorIdxBg = 0x0C;
                    break;
                case 'FFFF00':
                    $colorIdxBg = 0x0D;
                    break;
                case 'FF00FF':
                    $colorIdxBg = 0x0E;
                    break;
                case '00FFFF':
                    $colorIdxBg = 0x0F;
                    break;
                case '800000':
                    $colorIdxBg = 0x10;
                    break;
                case '008000':
                    $colorIdxBg = 0x11;
                    break;
                case '000080':
                    $colorIdxBg = 0x12;
                    break;
                case '808000':
                    $colorIdxBg = 0x13;
                    break;
                case '800080':
                    $colorIdxBg = 0x14;
                    break;
                case '008080':
                    $colorIdxBg = 0x15;
                    break;
                case 'C0C0C0':
                    $colorIdxBg = 0x16;
                    break;
                case '808080':
                    $colorIdxBg = 0x17;
                    break;
                case '9999FF':
                    $colorIdxBg = 0x18;
                    break;
                case '993366':
                    $colorIdxBg = 0x19;
                    break;
                case 'FFFFCC':
                    $colorIdxBg = 0x1A;
                    break;
                case 'CCFFFF':
                    $colorIdxBg = 0x1B;
                    break;
                case '660066':
                    $colorIdxBg = 0x1C;
                    break;
                case 'FF8080':
                    $colorIdxBg = 0x1D;
                    break;
                case '0066CC':
                    $colorIdxBg = 0x1E;
                    break;
                case 'CCCCFF':
                    $colorIdxBg = 0x1F;
                    break;
                case '000080':
                    $colorIdxBg = 0x20;
                    break;
                case 'FF00FF':
                    $colorIdxBg = 0x21;
                    break;
                case 'FFFF00':
                    $colorIdxBg = 0x22;
                    break;
                case '00FFFF':
                    $colorIdxBg = 0x23;
                    break;
                case '800080':
                    $colorIdxBg = 0x24;
                    break;
                case '800000':
                    $colorIdxBg = 0x25;
                    break;
                case '008080':
                    $colorIdxBg = 0x26;
                    break;
                case '0000FF':
                    $colorIdxBg = 0x27;
                    break;
                case '00CCFF':
                    $colorIdxBg = 0x28;
                    break;
                case 'CCFFFF':
                    $colorIdxBg = 0x29;
                    break;
                case 'CCFFCC':
                    $colorIdxBg = 0x2A;
                    break;
                case 'FFFF99':
                    $colorIdxBg = 0x2B;
                    break;
                case '99CCFF':
                    $colorIdxBg = 0x2C;
                    break;
                case 'FF99CC':
                    $colorIdxBg = 0x2D;
                    break;
                case 'CC99FF':
                    $colorIdxBg = 0x2E;
                    break;
                case 'FFCC99':
                    $colorIdxBg = 0x2F;
                    break;
                case '3366FF':
                    $colorIdxBg = 0x30;
                    break;
                case '33CCCC':
                    $colorIdxBg = 0x31;
                    break;
                case '99CC00':
                    $colorIdxBg = 0x32;
                    break;
                case 'FFCC00':
                    $colorIdxBg = 0x33;
                    break;
                case 'FF9900':
                    $colorIdxBg = 0x34;
                    break;
                case 'FF6600':
                    $colorIdxBg = 0x35;
                    break;
                case '666699':
                    $colorIdxBg = 0x36;
                    break;
                case '969696':
                    $colorIdxBg = 0x37;
                    break;
                case '003366':
                    $colorIdxBg = 0x38;
                    break;
                case '339966':
                    $colorIdxBg = 0x39;
                    break;
                case '003300':
                    $colorIdxBg = 0x3A;
                    break;
                case '333300':
                    $colorIdxBg = 0x3B;
                    break;
                case '993300':
                    $colorIdxBg = 0x3C;
                    break;
                case '993366':
                    $colorIdxBg = 0x3D;
                    break;
                case '333399':
                    $colorIdxBg = 0x3E;
                    break;
                case '333333':
                    $colorIdxBg = 0x3F;
                    break;
                default:
                    $colorIdxBg = 0x41;
                    break;
            }
            // Fg Color
            switch ($conditional->getStyle()
                ->getFill()
                ->getEndColor()
                ->getRGB()) {
                case '000000':
                    $colorIdxFg = 0x08;
                    break;
                case 'FFFFFF':
                    $colorIdxFg = 0x09;
                    break;
                case 'FF0000':
                    $colorIdxFg = 0x0A;
                    break;
                case '00FF00':
                    $colorIdxFg = 0x0B;
                    break;
                case '0000FF':
                    $colorIdxFg = 0x0C;
                    break;
                case 'FFFF00':
                    $colorIdxFg = 0x0D;
                    break;
                case 'FF00FF':
                    $colorIdxFg = 0x0E;
                    break;
                case '00FFFF':
                    $colorIdxFg = 0x0F;
                    break;
                case '800000':
                    $colorIdxFg = 0x10;
                    break;
                case '008000':
                    $colorIdxFg = 0x11;
                    break;
                case '000080':
                    $colorIdxFg = 0x12;
                    break;
                case '808000':
                    $colorIdxFg = 0x13;
                    break;
                case '800080':
                    $colorIdxFg = 0x14;
                    break;
                case '008080':
                    $colorIdxFg = 0x15;
                    break;
                case 'C0C0C0':
                    $colorIdxFg = 0x16;
                    break;
                case '808080':
                    $colorIdxFg = 0x17;
                    break;
                case '9999FF':
                    $colorIdxFg = 0x18;
                    break;
                case '993366':
                    $colorIdxFg = 0x19;
                    break;
                case 'FFFFCC':
                    $colorIdxFg = 0x1A;
                    break;
                case 'CCFFFF':
                    $colorIdxFg = 0x1B;
                    break;
                case '660066':
                    $colorIdxFg = 0x1C;
                    break;
                case 'FF8080':
                    $colorIdxFg = 0x1D;
                    break;
                case '0066CC':
                    $colorIdxFg = 0x1E;
                    break;
                case 'CCCCFF':
                    $colorIdxFg = 0x1F;
                    break;
                case '000080':
                    $colorIdxFg = 0x20;
                    break;
                case 'FF00FF':
                    $colorIdxFg = 0x21;
                    break;
                case 'FFFF00':
                    $colorIdxFg = 0x22;
                    break;
                case '00FFFF':
                    $colorIdxFg = 0x23;
                    break;
                case '800080':
                    $colorIdxFg = 0x24;
                    break;
                case '800000':
                    $colorIdxFg = 0x25;
                    break;
                case '008080':
                    $colorIdxFg = 0x26;
                    break;
                case '0000FF':
                    $colorIdxFg = 0x27;
                    break;
                case '00CCFF':
                    $colorIdxFg = 0x28;
                    break;
                case 'CCFFFF':
                    $colorIdxFg = 0x29;
                    break;
                case 'CCFFCC':
                    $colorIdxFg = 0x2A;
                    break;
                case 'FFFF99':
                    $colorIdxFg = 0x2B;
                    break;
                case '99CCFF':
                    $colorIdxFg = 0x2C;
                    break;
                case 'FF99CC':
                    $colorIdxFg = 0x2D;
                    break;
                case 'CC99FF':
                    $colorIdxFg = 0x2E;
                    break;
                case 'FFCC99':
                    $colorIdxFg = 0x2F;
                    break;
                case '3366FF':
                    $colorIdxFg = 0x30;
                    break;
                case '33CCCC':
                    $colorIdxFg = 0x31;
                    break;
                case '99CC00':
                    $colorIdxFg = 0x32;
                    break;
                case 'FFCC00':
                    $colorIdxFg = 0x33;
                    break;
                case 'FF9900':
                    $colorIdxFg = 0x34;
                    break;
                case 'FF6600':
                    $colorIdxFg = 0x35;
                    break;
                case '666699':
                    $colorIdxFg = 0x36;
                    break;
                case '969696':
                    $colorIdxFg = 0x37;
                    break;
                case '003366':
                    $colorIdxFg = 0x38;
                    break;
                case '339966':
                    $colorIdxFg = 0x39;
                    break;
                case '003300':
                    $colorIdxFg = 0x3A;
                    break;
                case '333300':
                    $colorIdxFg = 0x3B;
                    break;
                case '993300':
                    $colorIdxFg = 0x3C;
                    break;
                case '993366':
                    $colorIdxFg = 0x3D;
                    break;
                case '333399':
                    $colorIdxFg = 0x3E;
                    break;
                case '333333':
                    $colorIdxFg = 0x3F;
                    break;
                default:
                    $colorIdxFg = 0x40;
                    break;
            }
            $dataBlockFill = pack('v', $blockFillPatternStyle);
            $dataBlockFill .= pack('v', $colorIdxFg | ($colorIdxBg << 7));
        }
        if ($bFormatProt == 1) {
            $dataBlockProtection = 0;
            if ($conditional->getStyle()
                ->getProtection()
                ->getLocked() == PHPExcel_Style_Protection::PROTECTION_PROTECTED) {
                $dataBlockProtection = 1;
            }
            if ($conditional->getStyle()
                ->getProtection()
                ->getHidden() == PHPExcel_Style_Protection::PROTECTION_PROTECTED) {
                $dataBlockProtection = 1 << 1;
            }
        }
        
        $data = pack('CCvvVv', $type, $operatorType, $szValue1, $szValue2, $flags, 0x0000);
        if ($bFormatFont == 1) { // Block Formatting : OK
            $data .= $dataBlockFont;
        }
        if ($bFormatAlign == 1) {
            $data .= $dataBlockAlign;
        }
        if ($bFormatBorder == 1) {
            $data .= $dataBlockBorder;
        }
        if ($bFormatFill == 1) { // Block Formatting : OK
            $data .= $dataBlockFill;
        }
        if ($bFormatProt == 1) {
            $data .= $dataBlockProtection;
        }
        if (! is_null($operand1)) {
            $data .= $operand1;
        }
        if (! is_null($operand2)) {
            $data .= $operand2;
        }
        $header = pack('vv', $record, strlen($data));
        $this->_append($header . $data);
    }

    /**
     * Write CFHeader record
     */
    private function _writeCFHeader()
    {
        $record = 0x01B0; // Record identifier
        $length = 0x0016; // Bytes to follow
        
        $numColumnMin = null;
        $numColumnMax = null;
        $numRowMin = null;
        $numRowMax = null;
        $arrConditional = array();
        foreach ($this->_phpSheet->getConditionalStylesCollection() as $cellCoordinate => $conditionalStyles) {
            foreach ($conditionalStyles as $conditional) {
                if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_EXPRESSION || $conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CELLIS) {
                    if (! in_array($conditional->getHashCode(), $arrConditional)) {
                        $arrConditional[] = $conditional->getHashCode();
                    }
                    // Cells
                    $arrCoord = PHPExcel_Cell::coordinateFromString($cellCoordinate);
                    if (! is_numeric($arrCoord[0])) {
                        $arrCoord[0] = PHPExcel_Cell::columnIndexFromString($arrCoord[0]);
                    }
                    if (is_null($numColumnMin) || ($numColumnMin > $arrCoord[0])) {
                        $numColumnMin = $arrCoord[0];
                    }
                    if (is_null($numColumnMax) || ($numColumnMax < $arrCoord[0])) {
                        $numColumnMax = $arrCoord[0];
                    }
                    if (is_null($numRowMin) || ($numRowMin > $arrCoord[1])) {
                        $numRowMin = $arrCoord[1];
                    }
                    if (is_null($numRowMax) || ($numRowMax < $arrCoord[1])) {
                        $numRowMax = $arrCoord[1];
                    }
                }
            }
        }
        $needRedraw = 1;
        $cellRange = pack('vvvv', $numRowMin - 1, $numRowMax - 1, $numColumnMin - 1, $numColumnMax - 1);
        
        $header = pack('vv', $record, $length);
        $data = pack('vv', count($arrConditional), $needRedraw);
        $data .= $cellRange;
        $data .= pack('v', 0x0001);
        $data .= $cellRange;
        $this->_append($header . $data);
    }
}